78801574821 has 16 divisors (see below), whose sum is σ = 109648310784. Its totient is φ = 50245083504.

The previous prime is 78801574781. The next prime is 78801574837. The reversal of 78801574821 is 12847510887.

It is not a de Polignac number, because 78801574821 - 2¹⁸ = 78801312677 is a prime.

It is a super-2 number, since 2×78801574821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78801574921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679530 + ... + 786996.

It is an arithmetic number, because the mean of its divisors is an integer number (6853019424).

Almost surely, 2^78801574821 is an apocalyptic number.

It is an amenable number.

78801574821 is a deficient number, since it is larger than the sum of its proper divisors (30846735963).

78801574821 is a wasteful number, since it uses less digits than its factorization.

78801574821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118120.

The product of its (nonzero) digits is 1003520, while the sum is 51.

The spelling of 78801574821 in words is "seventy-eight billion, eight hundred one million, five hundred seventy-four thousand, eight hundred twenty-one".