851521666002 has 32 divisors (see below), whose sum is σ = 1993806831744. Its totient is φ = 237357955200.

The previous prime is 851521665919. The next prime is 851521666031. The reversal of 851521666002 is 200666125158.

851521666002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247246149 + ... + 247249592.

It is an arithmetic number, because the mean of its divisors is an integer number (62306463492).

Almost surely, 2^851521666002 is an apocalyptic number.

851521666002 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

851521666002 is an abundant number, since it is smaller than the sum of its proper divisors (1142285165742).

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

851521666002 is a wasteful number, since it uses less digits than its factorization.

851521666002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494495794.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 851521666002 in words is "eight hundred fifty-one billion, five hundred twenty-one million, six hundred sixty-six thousand, two".