79428666515 has 32 divisors (see below), whose sum is σ = 109388102400. Its totient is φ = 54828968320.

The previous prime is 79428666491. The next prime is 79428666521. The reversal of 79428666515 is 51566682497.

It is not a de Polignac number, because 79428666515 - 2¹² = 79428662419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 327917 + ... + 516126.

It is an arithmetic number, because the mean of its divisors is an integer number (3418378200).

Almost surely, 2^79428666515 is an apocalyptic number.

79428666515 is a deficient number, since it is larger than the sum of its proper divisors (29959435885).

79428666515 is a wasteful number, since it uses less digits than its factorization.

79428666515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844147.

The product of its digits is 21772800, while the sum is 59.

The spelling of 79428666515 in words is "seventy-nine billion, four hundred twenty-eight million, six hundred sixty-six thousand, five hundred fifteen".