64651362122129 has 4 divisors (see below), whose sum is σ = 65317871010084. Its totient is φ = 63984853234176.

The previous prime is 64651362122119. The next prime is 64651362122131. The reversal of 64651362122129 is 92122126315646.

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 53761494121729 + 10889868000400 = 7332223^2 + 3299980^2 .

It is a de Polignac number, because none of the positive numbers 2^k-64651362122129 is a prime.

It is a super-2 number, since 2×64651362122129² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64651362122119) 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, 333254443832 + ... + 333254444025.

It is an arithmetic number, because the mean of its divisors is an integer number (16329467752521).

Almost surely, 2^{64651362122129} is an apocalyptic number.

It is an amenable number.

64651362122129 is a deficient number, since it is larger than the sum of its proper divisors (666508887955).

64651362122129 is an equidigital number, since it uses as much as digits as its factorization.

64651362122129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666508887954.

The product of its digits is 1866240, while the sum is 50.

The spelling of 64651362122129 in words is "sixty-four trillion, six hundred fifty-one billion, three hundred sixty-two million, one hundred twenty-two thousand, one hundred twenty-nine".