79905911644 has 48 divisors (see below), whose sum is σ = 152624102400. Its totient is φ = 36382746816.

The previous prime is 79905911623. The next prime is 79905911653. The reversal of 79905911644 is 44611950997.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5411079 + ... + 5425825.

It is an arithmetic number, because the mean of its divisors is an integer number (3179668800).

Almost surely, 2^79905911644 is an apocalyptic number.

It is an amenable number.

79905911644 is a deficient number, since it is larger than the sum of its proper divisors (72718190756).

79905911644 is a wasteful number, since it uses less digits than its factorization.

79905911644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16162 (or 16160 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 79905911644 in words is "seventy-nine billion, nine hundred five million, nine hundred eleven thousand, six hundred forty-four".