79551638402 has 8 divisors (see below), whose sum is σ = 119339036796. Its totient is φ = 39771959472.

The previous prime is 79551638189. The next prime is 79551638407. The reversal of 79551638402 is 20483615597.

It is a happy number.

It is a Cunningham number, because it is equal to 282049²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 79551638401 + 1 = 282049^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×79551638402² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79551638407) 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, 1904033 + ... + 1945364.

It is a 2-persistent number, because it is pandigital, and so is 2⋅79551638402 = 159103276804, but 3⋅79551638402 = 238654915206 is not.

Almost surely, 2^79551638402 is an apocalyptic number.

79551638402 is a deficient number, since it is larger than the sum of its proper divisors (39787398394).

79551638402 is a wasteful number, since it uses less digits than its factorization.

79551638402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859732.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 79551638402 in words is "seventy-nine billion, five hundred fifty-one million, six hundred thirty-eight thousand, four hundred two".