79147085521 has 64 divisors (see below), whose sum is σ = 101284577280. Its totient is φ = 60285818880.

The previous prime is 79147085519. The next prime is 79147085533. The reversal of 79147085521 is 12558074197.

It is not a de Polignac number, because 79147085521 - 2¹ = 79147085519 is a prime.

It is a super-2 number, since 2×79147085521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79147085821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 83049981 + ... + 83050933.

It is an arithmetic number, because the mean of its divisors is an integer number (1582571520).

Almost surely, 2^79147085521 is an apocalyptic number.

It is an amenable number.

79147085521 is a deficient number, since it is larger than the sum of its proper divisors (22137491759).

79147085521 is a wasteful number, since it uses less digits than its factorization.

79147085521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 79147085521 in words is "seventy-nine billion, one hundred forty-seven million, eighty-five thousand, five hundred twenty-one".