64157122777 has 4 divisors (see below), whose sum is σ = 69989588496. Its totient is φ = 58324657060.

The previous prime is 64157122753. The next prime is 64157122781. The reversal of 64157122777 is 77722175146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64157122777 is a prime.

It is a super-2 number, since 2×64157122777² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64157122777.

It is not an unprimeable number, because it can be changed into a prime (64157122727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2916232843 + ... + 2916232864.

It is an arithmetic number, because the mean of its divisors is an integer number (17497397124).

Almost surely, 2^64157122777 is an apocalyptic number.

It is an amenable number.

64157122777 is a deficient number, since it is larger than the sum of its proper divisors (5832465719).

64157122777 is a wasteful number, since it uses less digits than its factorization.

64157122777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5832465718.

The product of its digits is 1152480, while the sum is 49.

The spelling of 64157122777 in words is "sixty-four billion, one hundred fifty-seven million, one hundred twenty-two thousand, seven hundred seventy-seven".