78699372481 has 4 divisors (see below), whose sum is σ = 82121084352. Its totient is φ = 75277660612.

The previous prime is 78699372463. The next prime is 78699372491. The reversal of 78699372481 is 18427399687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78699372481 - 2²³ = 78690983873 is a prime.

It is a super-2 number, since 2×78699372481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78699372461) 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, 1710855901 + ... + 1710855946.

It is an arithmetic number, because the mean of its divisors is an integer number (20530271088).

Almost surely, 2^78699372481 is an apocalyptic number.

It is an amenable number.

78699372481 is a deficient number, since it is larger than the sum of its proper divisors (3421711871).

78699372481 is a wasteful number, since it uses less digits than its factorization.

78699372481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421711870.

The product of its digits is 36578304, while the sum is 64.

The spelling of 78699372481 in words is "seventy-eight billion, six hundred ninety-nine million, three hundred seventy-two thousand, four hundred eighty-one".