64561136406131 has 4 divisors (see below), whose sum is σ = 68358850312392. Its totient is φ = 60763422499872.

The previous prime is 64561136405993. The next prime is 64561136406133. The reversal of 64561136406131 is 13160463116546.

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

It is a cyclic number.

It is not a de Polignac number, because 64561136406131 - 2²² = 64561132211827 is a prime.

It is a super-2 number, since 2×64561136406131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64561136406133) 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, 1898856953105 + ... + 1898856953138.

It is an arithmetic number, because the mean of its divisors is an integer number (17089712578098).

Almost surely, 2^{64561136406131} is an apocalyptic number.

64561136406131 is a deficient number, since it is larger than the sum of its proper divisors (3797713906261).

64561136406131 is a wasteful number, since it uses less digits than its factorization.

64561136406131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797713906260.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 64561136406131 in words is "sixty-four trillion, five hundred sixty-one billion, one hundred thirty-six million, four hundred six thousand, one hundred thirty-one".