85720491857856 has 56 divisors (see below), whose sum is σ = 238739089175680. Its totient is φ = 27069629006592.

The previous prime is 85720491857789. The next prime is 85720491857929. The reversal of 85720491857856 is 65875819402758.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11748967276 + ... + 11748974571.

Almost surely, 2^{85720491857856} is an apocalyptic number.

It is an amenable number.

85720491857856 is an abundant number, since it is smaller than the sum of its proper divisors (153018597317824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85720491857856 is a wasteful number, since it uses less digits than its factorization.

85720491857856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23497941881 (or 23497941871 counting only the distinct ones).

The product of its (nonzero) digits is 1354752000, while the sum is 75.

The spelling of 85720491857856 in words is "eighty-five trillion, seven hundred twenty billion, four hundred ninety-one million, eight hundred fifty-seven thousand, eight hundred fifty-six".