521646414646 has 64 divisors (see below), whose sum is σ = 923048275968. Its totient is φ = 216479323008.

The previous prime is 521646414613. The next prime is 521646414691. The reversal of 521646414646 is 646414646125.

It is a happy number.

It is a super-2 number, since 2×521646414646² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521646414646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68787771 + ... + 68795353.

It is an arithmetic number, because the mean of its divisors is an integer number (14422629312).

Almost surely, 2^521646414646 is an apocalyptic number.

521646414646 is a deficient number, since it is larger than the sum of its proper divisors (401401861322).

521646414646 is a wasteful number, since it uses less digits than its factorization.

521646414646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845.

The product of its digits is 3317760, while the sum is 49.

The spelling of 521646414646 in words is "five hundred twenty-one billion, six hundred forty-six million, four hundred fourteen thousand, six hundred forty-six".