77825466402281 has 4 divisors (see below), whose sum is σ = 83812040740932. Its totient is φ = 71838892063632.

The previous prime is 77825466402263. The next prime is 77825466402287. The reversal of 77825466402281 is 18220466452877.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21811618024681 + 56013848377600 = 4670291^2 + 7484240^2 .

It is a cyclic number.

It is not a de Polignac number, because 77825466402281 - 2⁶ = 77825466402217 is a prime.

It is a super-2 number, since 2×77825466402281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77825466402287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2993287169306 + ... + 2993287169331.

It is an arithmetic number, because the mean of its divisors is an integer number (20953010185233).

Almost surely, 2^{77825466402281} is an apocalyptic number.

It is an amenable number.

77825466402281 is a deficient number, since it is larger than the sum of its proper divisors (5986574338651).

77825466402281 is a wasteful number, since it uses less digits than its factorization.

77825466402281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5986574338650.

The product of its (nonzero) digits is 72253440, while the sum is 62.

The spelling of 77825466402281 in words is "seventy-seven trillion, eight hundred twenty-five billion, four hundred sixty-six million, four hundred two thousand, two hundred eighty-one".