64187130779 has 4 divisors (see below), whose sum is σ = 67565400840. Its totient is φ = 60808860720.

The previous prime is 64187130727. The next prime is 64187130827. The reversal of 64187130779 is 97703178146.

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 64187130779 - 2⁸ = 64187130523 is a prime.

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 64187130779.

It is not an unprimeable number, because it can be changed into a prime (64187130179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1689135002 + ... + 1689135039.

It is an arithmetic number, because the mean of its divisors is an integer number (16891350210).

Almost surely, 2^64187130779 is an apocalyptic number.

64187130779 is a deficient number, since it is larger than the sum of its proper divisors (3378270061).

64187130779 is a wasteful number, since it uses less digits than its factorization.

64187130779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378270060.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The spelling of 64187130779 in words is "sixty-four billion, one hundred eighty-seven million, one hundred thirty thousand, seven hundred seventy-nine".