79954038399 has 32 divisors (see below), whose sum is σ = 111385903104. Its totient is φ = 50958188640.

The previous prime is 79954038383. The next prime is 79954038413. The reversal of 79954038399 is 99383045997.

It is a happy number.

It is not a de Polignac number, because 79954038399 - 2⁴ = 79954038383 is a prime.

It is a super-3 number, since 3×79954038399³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79954038299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2515762 + ... + 2547344.

It is an arithmetic number, because the mean of its divisors is an integer number (3480809472).

Almost surely, 2^79954038399 is an apocalyptic number.

79954038399 is a deficient number, since it is larger than the sum of its proper divisors (31431864705).

79954038399 is a wasteful number, since it uses less digits than its factorization.

79954038399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31947.

The product of its (nonzero) digits is 66134880, while the sum is 66.

The spelling of 79954038399 in words is "seventy-nine billion, nine hundred fifty-four million, thirty-eight thousand, three hundred ninety-nine".