68639782616 has 32 divisors (see below), whose sum is σ = 133402558080. Its totient is φ = 33074956800.

The previous prime is 68639782613. The next prime is 68639782637. The reversal of 68639782616 is 61628793686.

It is a super-2 number, since 2×68639782616² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68639782613) 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, 514451 + ... + 633986.

It is an arithmetic number, because the mean of its divisors is an integer number (4168829940).

Almost surely, 2^68639782616 is an apocalyptic number.

It is an amenable number.

68639782616 is a deficient number, since it is larger than the sum of its proper divisors (64762775464).

68639782616 is a wasteful number, since it uses less digits than its factorization.

68639782616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148715 (or 1148711 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 62.

The spelling of 68639782616 in words is "sixty-eight billion, six hundred thirty-nine million, seven hundred eighty-two thousand, six hundred sixteen".