64191836957 has 4 divisors (see below), whose sum is σ = 64418663520. Its totient is φ = 63965010396.

The previous prime is 64191836941. The next prime is 64191837011. The reversal of 64191836957 is 75963819146.

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 not a de Polignac number, because 64191836957 - 2⁴ = 64191836941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64191836896 and 64191836905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64191835957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113412857 + ... + 113413422.

It is an arithmetic number, because the mean of its divisors is an integer number (16104665880).

Almost surely, 2^64191836957 is an apocalyptic number.

It is an amenable number.

64191836957 is a deficient number, since it is larger than the sum of its proper divisors (226826563).

64191836957 is a wasteful number, since it uses less digits than its factorization.

64191836957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226826562.

The product of its digits is 9797760, while the sum is 59.

The spelling of 64191836957 in words is "sixty-four billion, one hundred ninety-one million, eight hundred thirty-six thousand, nine hundred fifty-seven".