64112987267721 has 12 divisors (see below), whose sum is σ = 105837312315072. Its totient is φ = 36635992724376.

The previous prime is 64112987267671. The next prime is 64112987267789. The reversal of 64112987267721 is 12776278921146.

64112987267721 is a `hidden beast` number, since 6 + 4 + 11 + 298 + 7 + 267 + 72 + 1 = 666.

It is not a de Polignac number, because 64112987267721 - 2¹¹ = 64112987265673 is a prime.

It is a super-2 number, since 2×64112987267721² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 1017666464567 = 64112987267721 / (6 + 4 + 1 + 1 + 2 + 9 + 8 + 7 + 2 + 6 + 7 + 7 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (64112987266721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 508833232221 + ... + 508833232346.

It is an arithmetic number, because the mean of its divisors is an integer number (8819776026256).

Almost surely, 2^{64112987267721} is an apocalyptic number.

It is an amenable number.

64112987267721 is a deficient number, since it is larger than the sum of its proper divisors (41724325047351).

64112987267721 is a wasteful number, since it uses less digits than its factorization.

64112987267721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017666464580 (or 1017666464577 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 64112987267721 in words is "sixty-four trillion, one hundred twelve billion, nine hundred eighty-seven million, two hundred sixty-seven thousand, seven hundred twenty-one".