64195909886 has 4 divisors (see below), whose sum is σ = 96293864832. Its totient is φ = 32097954942.

The previous prime is 64195909873. The next prime is 64195909889. The reversal of 64195909886 is 68890959146.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×64195909886² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64195909889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16048977470 + ... + 16048977473.

It is an arithmetic number, because the mean of its divisors is an integer number (24073466208).

Almost surely, 2^64195909886 is an apocalyptic number.

64195909886 is a deficient number, since it is larger than the sum of its proper divisors (32097954946).

64195909886 is a wasteful number, since it uses less digits than its factorization.

64195909886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32097954945.

The product of its (nonzero) digits is 33592320, while the sum is 65.

The spelling of 64195909886 in words is "sixty-four billion, one hundred ninety-five million, nine hundred nine thousand, eight hundred eighty-six".