64647378196 has 24 divisors (see below), whose sum is σ = 114311010240. Its totient is φ = 31987976832.

The previous prime is 64647378193. The next prime is 64647378233. The reversal of 64647378196 is 69187374646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64647378193) 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, 181915 + ... + 402973.

It is an arithmetic number, because the mean of its divisors is an integer number (4762958760).

Almost surely, 2^64647378196 is an apocalyptic number.

It is an amenable number.

64647378196 is a deficient number, since it is larger than the sum of its proper divisors (49663632044).

64647378196 is a wasteful number, since it uses less digits than its factorization.

64647378196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221823 (or 221821 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 61.

The spelling of 64647378196 in words is "sixty-four billion, six hundred forty-seven million, three hundred seventy-eight thousand, one hundred ninety-six".