251404533066 has 16 divisors (see below), whose sum is σ = 502818876000. Its totient is φ = 83799876048.

The previous prime is 251404533053. The next prime is 251404533067. The reversal of 251404533066 is 660335404152.

It is a super-2 number, since 2×251404533066² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251404533067) 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, 51576 + ... + 710963.

It is an arithmetic number, because the mean of its divisors is an integer number (31426179750).

Almost surely, 2^251404533066 is an apocalyptic number.

251404533066 is an abundant number, since it is smaller than the sum of its proper divisors (251414342934).

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

251404533066 is a wasteful number, since it uses less digits than its factorization.

251404533066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817493.

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 251404533066 in words is "two hundred fifty-one billion, four hundred four million, five hundred thirty-three thousand, sixty-six".