64127577891 has 16 divisors (see below), whose sum is σ = 92101756320. Its totient is φ = 39454068480.

The previous prime is 64127577869. The next prime is 64127577907. The reversal of 64127577891 is 19877572146.

It is not a de Polignac number, because 64127577891 - 2⁶ = 64127577827 is a prime.

It is a super-2 number, since 2×64127577891² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64127577851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14520 + ... + 358421.

It is an arithmetic number, because the mean of its divisors is an integer number (5756359770).

Almost surely, 2^64127577891 is an apocalyptic number.

64127577891 is a deficient number, since it is larger than the sum of its proper divisors (27974178429).

64127577891 is a wasteful number, since it uses less digits than its factorization.

64127577891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377366.

The product of its digits is 5927040, while the sum is 57.

The spelling of 64127577891 in words is "sixty-four billion, one hundred twenty-seven million, five hundred seventy-seven thousand, eight hundred ninety-one".