64693019538 has 48 divisors (see below), whose sum is σ = 165359740416. Its totient is φ = 17887469760.

The previous prime is 64693019537. The next prime is 64693019551. The reversal of 64693019538 is 83591039646.

64693019538 is a `hidden beast` number, since 6 + 4 + 6 + 93 + 0 + 19 + 538 = 666.

It is not an unprimeable number, because it can be changed into a prime (64693019537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8277331 + ... + 8285142.

It is an arithmetic number, because the mean of its divisors is an integer number (3444994592).

Almost surely, 2^64693019538 is an apocalyptic number.

64693019538 is an abundant number, since it is smaller than the sum of its proper divisors (100666720878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64693019538 is a wasteful number, since it uses less digits than its factorization.

64693019538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16562519 (or 16562516 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 64693019538 in words is "sixty-four billion, six hundred ninety-three million, nineteen thousand, five hundred thirty-eight".