251355478002 has 16 divisors (see below), whose sum is σ = 503218244352. Its totient is φ = 83700611280.

The previous prime is 251355477959. The next prime is 251355478007. The reversal of 251355478002 is 200874553152.

It is a super-2 number, since 2×251355478002² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251355478007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21130573 + ... + 21142464.

It is an arithmetic number, because the mean of its divisors is an integer number (31451140272).

Almost surely, 2^251355478002 is an apocalyptic number.

251355478002 is an abundant number, since it is smaller than the sum of its proper divisors (251862766350).

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

251355478002 is a wasteful number, since it uses less digits than its factorization.

251355478002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42274033.

The product of its (nonzero) digits is 336000, while the sum is 42.

The spelling of 251355478002 in words is "two hundred fifty-one billion, three hundred fifty-five million, four hundred seventy-eight thousand, two".