85902121851 has 24 divisors (see below), whose sum is σ = 141742137600. Its totient is φ = 45311007456.

The previous prime is 85902121843. The next prime is 85902121889. The reversal of 85902121851 is 15812120958.

It is not a de Polignac number, because 85902121851 - 2³ = 85902121843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85902121831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12098751 + ... + 12105848.

It is an arithmetic number, because the mean of its divisors is an integer number (5905922400).

Almost surely, 2^85902121851 is an apocalyptic number.

85902121851 is a deficient number, since it is larger than the sum of its proper divisors (55840015749).

85902121851 is a wasteful number, since it uses less digits than its factorization.

85902121851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24204635 (or 24204622 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 42.

The spelling of 85902121851 in words is "eighty-five billion, nine hundred two million, one hundred twenty-one thousand, eight hundred fifty-one".