251606385516 has 24 divisors (see below), whose sum is σ = 587138356224. Its totient is φ = 83860682320.

The previous prime is 251606385473. The next prime is 251606385553. The reversal of 251606385516 is 615583606152.

It is a happy number.

251606385516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884220 + ... + 1133603.

It is an arithmetic number, because the mean of its divisors is an integer number (24464098176).

Almost surely, 2^251606385516 is an apocalyptic number.

It is an amenable number.

251606385516 is an abundant number, since it is smaller than the sum of its proper divisors (335531970708).

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

251606385516 is a wasteful number, since it uses less digits than its factorization.

251606385516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028221 (or 2028219 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 48.

The spelling of 251606385516 in words is "two hundred fifty-one billion, six hundred six million, three hundred eighty-five thousand, five hundred sixteen".