64601377771 has 32 divisors (see below), whose sum is σ = 76414607360. Its totient is φ = 53459191296.

The previous prime is 64601377727. The next prime is 64601377879. The reversal of 64601377771 is 17777310646.

It is not a de Polignac number, because 64601377771 - 2¹³ = 64601369579 is a prime.

It is a super-2 number, since 2×64601377771² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64601377721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19462450 + ... + 19465768.

It is an arithmetic number, because the mean of its divisors is an integer number (2387956480).

Almost surely, 2^64601377771 is an apocalyptic number.

64601377771 is a deficient number, since it is larger than the sum of its proper divisors (11813229589).

64601377771 is a wasteful number, since it uses less digits than its factorization.

64601377771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923.

The product of its (nonzero) digits is 1037232, while the sum is 49.

The spelling of 64601377771 in words is "sixty-four billion, six hundred one million, three hundred seventy-seven thousand, seven hundred seventy-one".