64938986271697 has 4 divisors (see below), whose sum is σ = 64984429930420. Its totient is φ = 64893542612976.

The previous prime is 64938986271659. The next prime is 64938986271751. The reversal of 64938986271697 is 79617268983946.

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 4806964165441 + 60132022106256 = 2192479^2 + 7754484^2 .

It is a cyclic number.

It is not a de Polignac number, because 64938986271697 - 2¹¹ = 64938986269649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64938986271617) 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, 22721827218 + ... + 22721830075.

It is an arithmetic number, because the mean of its divisors is an integer number (16246107482605).

Almost surely, 2^{64938986271697} is an apocalyptic number.

It is an amenable number.

64938986271697 is a deficient number, since it is larger than the sum of its proper divisors (45443658723).

64938986271697 is a wasteful number, since it uses less digits than its factorization.

64938986271697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45443658722.

The product of its digits is 11851370496, while the sum is 85.

The spelling of 64938986271697 in words is "sixty-four trillion, nine hundred thirty-eight billion, nine hundred eighty-six million, two hundred seventy-one thousand, six hundred ninety-seven".