85811520537778 has 8 divisors (see below), whose sum is σ = 147105463779072. Its totient is φ = 36776365944756.

The previous prime is 85811520537709. The next prime is 85811520537797. The reversal of 85811520537778 is 87773502511858.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3064697162050 + ... + 3064697162077.

It is an arithmetic number, because the mean of its divisors is an integer number (18388182972384).

Almost surely, 2^{85811520537778} is an apocalyptic number.

85811520537778 is a deficient number, since it is larger than the sum of its proper divisors (61293943241294).

85811520537778 is a wasteful number, since it uses less digits than its factorization.

85811520537778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6129394324136.

The product of its (nonzero) digits is 131712000, while the sum is 67.

The spelling of 85811520537778 in words is "eighty-five trillion, eight hundred eleven billion, five hundred twenty million, five hundred thirty-seven thousand, seven hundred seventy-eight".