64506036257 has 16 divisors (see below), whose sum is σ = 73677340800. Its totient is φ = 55947770112.

The previous prime is 64506036247. The next prime is 64506036263. The reversal of 64506036257 is 75263060546.

It is a happy number.

It is not a de Polignac number, because 64506036257 - 2¹⁶ = 64505970721 is a prime.

It is a super-2 number, since 2×64506036257² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64506036247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111263 + ... + 376020.

It is an arithmetic number, because the mean of its divisors is an integer number (4604833800).

Almost surely, 2^64506036257 is an apocalyptic number.

It is an amenable number.

64506036257 is a deficient number, since it is larger than the sum of its proper divisors (9171304543).

64506036257 is a wasteful number, since it uses less digits than its factorization.

64506036257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487912.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 64506036257 in words is "sixty-four billion, five hundred six million, thirty-six thousand, two hundred fifty-seven".