85387380521 has 4 divisors (see below), whose sum is σ = 89881453200. Its totient is φ = 80893307844.

The previous prime is 85387380389. The next prime is 85387380563. The reversal of 85387380521 is 12508378358.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85387380521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85387380521.

It is not an unprimeable number, because it can be changed into a prime (85387380571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2247036311 + ... + 2247036348.

It is an arithmetic number, because the mean of its divisors is an integer number (22470363300).

Almost surely, 2^85387380521 is an apocalyptic number.

It is an amenable number.

85387380521 is a deficient number, since it is larger than the sum of its proper divisors (4494072679).

85387380521 is a wasteful number, since it uses less digits than its factorization.

85387380521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4494072678.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 85387380521 in words is "eighty-five billion, three hundred eighty-seven million, three hundred eighty thousand, five hundred twenty-one".