521163540254 has 32 divisors (see below), whose sum is σ = 900561908736. Its totient is φ = 221576454720.

The previous prime is 521163540253. The next prime is 521163540283. The reversal of 521163540254 is 452045361125.

It is a super-2 number, since 2×521163540254² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521163540253) 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, 954434 + ... + 1397594.

It is an arithmetic number, because the mean of its divisors is an integer number (28142559648).

Almost surely, 2^521163540254 is an apocalyptic number.

521163540254 is a deficient number, since it is larger than the sum of its proper divisors (379398368482).

521163540254 is a wasteful number, since it uses less digits than its factorization.

521163540254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443840.

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 521163540254 in words is "five hundred twenty-one billion, one hundred sixty-three million, five hundred forty thousand, two hundred fifty-four".