251331738945 has 16 divisors (see below), whose sum is σ = 459578037120. Its totient is φ = 114894509184.

The previous prime is 251331738899. The next prime is 251331738949. The reversal of 251331738945 is 549837133152.

It is a happy number.

It is not a de Polignac number, because 251331738945 - 2⁸ = 251331738689 is a prime.

It is a super-2 number, since 2×251331738945² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251331738949) 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, 1196817700 + ... + 1196817909.

It is an arithmetic number, because the mean of its divisors is an integer number (28723627320).

Almost surely, 2^251331738945 is an apocalyptic number.

It is an amenable number.

251331738945 is a deficient number, since it is larger than the sum of its proper divisors (208246298175).

251331738945 is a wasteful number, since it uses less digits than its factorization.

251331738945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393635624.

The product of its digits is 2721600, while the sum is 51.

The spelling of 251331738945 in words is "two hundred fifty-one billion, three hundred thirty-one million, seven hundred thirty-eight thousand, nine hundred forty-five".