79844540385 has 32 divisors (see below), whose sum is σ = 131955268608. Its totient is φ = 41184149760.

The previous prime is 79844540359. The next prime is 79844540429. The reversal of 79844540385 is 58304544897.

It is a happy number.

It is not a de Polignac number, because 79844540385 - 2⁸ = 79844540129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 696819 + ... + 803271.

It is an arithmetic number, because the mean of its divisors is an integer number (4123602144).

Almost surely, 2^79844540385 is an apocalyptic number.

It is an amenable number.

79844540385 is a deficient number, since it is larger than the sum of its proper divisors (52110728223).

79844540385 is a wasteful number, since it uses less digits than its factorization.

79844540385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108105.

The product of its (nonzero) digits is 19353600, while the sum is 57.

The spelling of 79844540385 in words is "seventy-nine billion, eight hundred forty-four million, five hundred forty thousand, three hundred eighty-five".