68513030731 has 4 divisors (see below), whose sum is σ = 69674268600. Its totient is φ = 67351792864.

The previous prime is 68513030717. The next prime is 68513030759. The reversal of 68513030731 is 13703031586.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68513030731 - 2⁷ = 68513030603 is a prime.

It is a super-2 number, since 2×68513030731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68513030701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580618846 + ... + 580618963.

It is an arithmetic number, because the mean of its divisors is an integer number (17418567150).

Almost surely, 2^68513030731 is an apocalyptic number.

68513030731 is a deficient number, since it is larger than the sum of its proper divisors (1161237869).

68513030731 is a wasteful number, since it uses less digits than its factorization.

68513030731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161237868.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 68513030731 in words is "sixty-eight billion, five hundred thirteen million, thirty thousand, seven hundred thirty-one".