64977516097 has 4 divisors (see below), whose sum is σ = 69975786580. Its totient is φ = 59979245616.

The previous prime is 64977516089. The next prime is 64977516101. The reversal of 64977516097 is 79061577946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14855709456 + 50121806641 = 121884^2 + 223879^2 .

It is a cyclic number.

It is not a de Polignac number, because 64977516097 - 2³ = 64977516089 is a prime.

It is a super-2 number, since 2×64977516097² (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 (64977516017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2499135222 + ... + 2499135247.

It is an arithmetic number, because the mean of its divisors is an integer number (17493946645).

Almost surely, 2^64977516097 is an apocalyptic number.

It is an amenable number.

64977516097 is a deficient number, since it is larger than the sum of its proper divisors (4998270483).

64977516097 is a wasteful number, since it uses less digits than its factorization.

64977516097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4998270482.

The product of its (nonzero) digits is 20003760, while the sum is 61.

The spelling of 64977516097 in words is "sixty-four billion, nine hundred seventy-seven million, five hundred sixteen thousand, ninety-seven".