64563202261 has 4 divisors (see below), whose sum is σ = 64563792300. Its totient is φ = 64562612224.

The previous prime is 64563202237. The next prime is 64563202283. The reversal of 64563202261 is 16220236546.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 32402160036 + 32161042225 = 180006^2 + 179335^2 .

It is a cyclic number.

It is not a de Polignac number, because 64563202261 - 2⁵ = 64563202229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64563202261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64563202861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77356 + ... + 367573.

It is an arithmetic number, because the mean of its divisors is an integer number (16140948075).

Almost surely, 2^64563202261 is an apocalyptic number.

It is an amenable number.

64563202261 is a deficient number, since it is larger than the sum of its proper divisors (590039).

64563202261 is a wasteful number, since it uses less digits than its factorization.

64563202261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590038.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 64563202261 in words is "sixty-four billion, five hundred sixty-three million, two hundred two thousand, two hundred sixty-one".