67992640443 has 72 divisors (see below), whose sum is σ = 124871340048. Its totient is φ = 35328763008.

The previous prime is 67992640421. The next prime is 67992640453. The reversal of 67992640443 is 34404629976.

67992640443 is a `hidden beast` number, since 6 + 79 + 92 + 6 + 40 + 443 = 666.

It is not a de Polignac number, because 67992640443 - 2²² = 67988446139 is a prime.

It is a super-2 number, since 2×67992640443² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67992640443.

It is not an unprimeable number, because it can be changed into a prime (67992640453) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 295605 + ... + 472617.

Almost surely, 2^67992640443 is an apocalyptic number.

67992640443 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

67992640443 is a deficient number, since it is larger than the sum of its proper divisors (56878699605).

67992640443 is a wasteful number, since it uses less digits than its factorization.

67992640443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177113 (or 177103 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 67992640443 in words is "sixty-seven billion, nine hundred ninety-two million, six hundred forty thousand, four hundred forty-three".