64649661562 has 16 divisors (see below), whose sum is σ = 97168211712. Its totient is φ = 32260306320.

The previous prime is 64649661553. The next prime is 64649661563. The reversal of 64649661562 is 26516694646.

It is a super-2 number, since 2×64649661562² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64649661563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3012723 + ... + 3034105.

It is an arithmetic number, because the mean of its divisors is an integer number (6073013232).

Almost surely, 2^64649661562 is an apocalyptic number.

64649661562 is a deficient number, since it is larger than the sum of its proper divisors (32518550150).

64649661562 is a wasteful number, since it uses less digits than its factorization.

64649661562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24333.

The product of its digits is 11197440, while the sum is 55.

The spelling of 64649661562 in words is "sixty-four billion, six hundred forty-nine million, six hundred sixty-one thousand, five hundred sixty-two".