521464601663 has 2 divisors, whose sum is σ = 521464601664. Its totient is φ = 521464601662.

The previous prime is 521464601659. The next prime is 521464601689. The reversal of 521464601663 is 366106464125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521464601663 - 2² = 521464601659 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521464601263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260732300831 + 260732300832.

It is an arithmetic number, because the mean of its divisors is an integer number (260732300832).

Almost surely, 2^521464601663 is an apocalyptic number.

521464601663 is a deficient number, since it is larger than the sum of its proper divisors (1).

521464601663 is an equidigital number, since it uses as much as digits as its factorization.

521464601663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 521464601663 in words is "five hundred twenty-one billion, four hundred sixty-four million, six hundred one thousand, six hundred sixty-three".