85371489856 has 21 divisors (see below), whose sum is σ = 169413688731. Its totient is φ = 42684576192.

The previous prime is 85371489851. The next prime is 85371489919. The reversal of 85371489856 is 65898417358.

The square root of 85371489856 is 292184.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×85371489856² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85371489851) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2319211 + ... + 2355733.

It is an arithmetic number, because the mean of its divisors is an integer number (8067318511).

Almost surely, 2^85371489856 is an apocalyptic number.

85371489856 is the 292184-th square number.

It is an amenable number.

85371489856 is a deficient number, since it is larger than the sum of its proper divisors (84042198875).

85371489856 is an frugal number, since it uses more digits than its factorization.

85371489856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73058 (or 36525 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 64.

Multiplying 85371489856 by its sum of digits (64), we get a square (5463775350784 = 2337472²).

85371489856 divided by its sum of digits (64) gives a square (1333929529 = 36523²).

The spelling of 85371489856 in words is "eighty-five billion, three hundred seventy-one million, four hundred eighty-nine thousand, eight hundred fifty-six".