251729120670 has 32 divisors (see below), whose sum is σ = 604178749440. Its totient is φ = 67124558880.

The previous prime is 251729120659. The next prime is 251729120677. The reversal of 251729120670 is 76021927152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251729120677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475435 + ... + 854105.

It is an arithmetic number, because the mean of its divisors is an integer number (18880585920).

Almost surely, 2^251729120670 is an apocalyptic number.

251729120670 is an abundant number, since it is smaller than the sum of its proper divisors (352449628770).

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

251729120670 is a wasteful number, since it uses less digits than its factorization.

251729120670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400840.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 251729120670 in words is "two hundred fifty-one billion, seven hundred twenty-nine million, one hundred twenty thousand, six hundred seventy".