64663615057 has 8 divisors (see below), whose sum is σ = 65364428736. Its totient is φ = 63964588272.

The previous prime is 64663615019. The next prime is 64663615073. The reversal of 64663615057 is 75051636646.

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 64663615057 - 2³¹ = 62516131409 is a prime.

It is a super-2 number, since 2×64663615057² (a number of 22 digits) contains 22 as substring.

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 64663615057.

It is not an unprimeable number, because it can be changed into a prime (64663615657) 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, 373893 + ... + 518770.

It is an arithmetic number, because the mean of its divisors is an integer number (8170553592).

Almost surely, 2^64663615057 is an apocalyptic number.

It is an amenable number.

64663615057 is a deficient number, since it is larger than the sum of its proper divisors (700813679).

64663615057 is a wasteful number, since it uses less digits than its factorization.

64663615057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893447.

The product of its (nonzero) digits is 2721600, while the sum is 49.

The spelling of 64663615057 in words is "sixty-four billion, six hundred sixty-three million, six hundred fifteen thousand, fifty-seven".