64563726257 has 8 divisors (see below), whose sum is σ = 66684763392. Its totient is φ = 62445085200.

The previous prime is 64563726193. The next prime is 64563726289. The reversal of 64563726257 is 75262736546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64563726257 - 2⁶ = 64563726193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64563726199 and 64563726208.

It is not an unprimeable number, because it can be changed into a prime (64563720257) 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, 544163 + ... + 652104.

It is an arithmetic number, because the mean of its divisors is an integer number (8335595424).

Almost surely, 2^64563726257 is an apocalyptic number.

It is an amenable number.

64563726257 is a deficient number, since it is larger than the sum of its proper divisors (2121037135).

64563726257 is a wasteful number, since it uses less digits than its factorization.

64563726257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198039.

The product of its digits is 12700800, while the sum is 53.

The spelling of 64563726257 in words is "sixty-four billion, five hundred sixty-three million, seven hundred twenty-six thousand, two hundred fifty-seven".