68691632137 has 4 divisors (see below), whose sum is σ = 68783099776. Its totient is φ = 68600164500.

The previous prime is 68691632059. The next prime is 68691632153. The reversal of 68691632137 is 73123619686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68691632137 - 2¹⁵ = 68691599369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68691638137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45732693 + ... + 45734194.

It is an arithmetic number, because the mean of its divisors is an integer number (17195774944).

Almost surely, 2^68691632137 is an apocalyptic number.

It is an amenable number.

68691632137 is a deficient number, since it is larger than the sum of its proper divisors (91467639).

68691632137 is an equidigital number, since it uses as much as digits as its factorization.

68691632137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91467638.

The product of its digits is 1959552, while the sum is 52.

The spelling of 68691632137 in words is "sixty-eight billion, six hundred ninety-one million, six hundred thirty-two thousand, one hundred thirty-seven".