521406431166 has 16 divisors (see below), whose sum is σ = 1042833315600. Its totient is φ = 173798734848.

The previous prime is 521406431099. The next prime is 521406431167. The reversal of 521406431166 is 661134604125.

It is a super-2 number, since 2×521406431166² (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 (521406431167) 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, 510261 + ... + 1141568.

It is an arithmetic number, because the mean of its divisors is an integer number (65177082225).

Almost surely, 2^521406431166 is an apocalyptic number.

521406431166 is an abundant number, since it is smaller than the sum of its proper divisors (521426884434).

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

521406431166 is a wasteful number, since it uses less digits than its factorization.

521406431166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704443.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 521406431166 in words is "five hundred twenty-one billion, four hundred six million, four hundred thirty-one thousand, one hundred sixty-six".