251956393422 has 8 divisors (see below), whose sum is σ = 503912786856. Its totient is φ = 83985464472.

The previous prime is 251956393399. The next prime is 251956393427. The reversal of 251956393422 is 224393659152.

It is a sphenic number, since it is the product of 3 distinct primes.

251956393422 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251956393427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20996366113 + ... + 20996366124.

It is an arithmetic number, because the mean of its divisors is an integer number (62989098357).

Almost surely, 2^251956393422 is an apocalyptic number.

251956393422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

251956393422 is a wasteful number, since it uses less digits than its factorization.

251956393422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41992732242.

The product of its digits is 3499200, while the sum is 51.

The spelling of 251956393422 in words is "two hundred fifty-one billion, nine hundred fifty-six million, three hundred ninety-three thousand, four hundred twenty-two".