70299749881 has 3 divisors (see below), whose sum is σ = 70300015023. Its totient is φ = 70299484740.

The previous prime is 70299749879. The next prime is 70299749911. The reversal of 70299749881 is 18894799207.

It is a happy number.

The square root of 70299749881 is 265141.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 65055093481 + 5244656400 = 255059^2 + 72420^2 .

It is not a de Polignac number, because 70299749881 - 2¹ = 70299749879 is a prime.

It is a super-2 number, since 2×70299749881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70299749831) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 132571 + ... + 397711.

It is an arithmetic number, because the mean of its divisors is an integer number (23433338341).

Almost surely, 2^70299749881 is an apocalyptic number.

70299749881 is the 265141-st square number.

70299749881 is the 132571-st centered octagonal number.

It is an amenable number.

70299749881 is a deficient number, since it is larger than the sum of its proper divisors (265142).

70299749881 is an frugal number, since it uses more digits than its factorization.

70299749881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530282 (or 265141 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 64.

Multiplying 70299749881 by its sum of digits (64), we get a square (4499183992384 = 2121128²).

The spelling of 70299749881 in words is "seventy billion, two hundred ninety-nine million, seven hundred forty-nine thousand, eight hundred eighty-one".