64696969690 has 32 divisors (see below), whose sum is σ = 119555149824. Its totient is φ = 25195532160.

The previous prime is 64696969633. The next prime is 64696969691. The reversal of 64696969690 is 9696969646.

It is a super-2 number, since 2×64696969690² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64696969691) 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 15 ways as a sum of consecutive naturals, for example, 270579 + ... + 450118.

It is an arithmetic number, because the mean of its divisors is an integer number (3736098432).

Almost surely, 2^64696969690 is an apocalyptic number.

64696969690 is a deficient number, since it is larger than the sum of its proper divisors (54858180134).

64696969690 is a wasteful number, since it uses less digits than its factorization.

64696969690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720942.

The product of its (nonzero) digits is 204073344, while the sum is 70.

The spelling of 64696969690 in words is "sixty-four billion, six hundred ninety-six million, nine hundred sixty-nine thousand, six hundred ninety".