67142028731 has 2 divisors, whose sum is σ = 67142028732. Its totient is φ = 67142028730.

The previous prime is 67142028721. The next prime is 67142028749. The reversal of 67142028731 is 13782024176.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67142028731 is a prime.

It is a super-2 number, since 2×67142028731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67142028721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33571014365 + 33571014366.

It is an arithmetic number, because the mean of its divisors is an integer number (33571014366).

Almost surely, 2^67142028731 is an apocalyptic number.

67142028731 is a deficient number, since it is larger than the sum of its proper divisors (1).

67142028731 is an equidigital number, since it uses as much as digits as its factorization.

67142028731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 67142028731 in words is "sixty-seven billion, one hundred forty-two million, twenty-eight thousand, seven hundred thirty-one".