37691368913021 has 2 divisors, whose sum is σ = 37691368913022. Its totient is φ = 37691368913020.

The previous prime is 37691368912997. The next prime is 37691368913117. The reversal of 37691368913021 is 12031986319673.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34924672284100 + 2766696628921 = 5909710^2 + 1663339^2 .

It is an emirp because it is prime and its reverse (12031986319673) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37691368913021 - 2²⁶ = 37691301804157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37691368913921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18845684456510 + 18845684456511.

It is an arithmetic number, because the mean of its divisors is an integer number (18845684456511).

Almost surely, 2^{37691368913021} is an apocalyptic number.

It is an amenable number.

37691368913021 is a deficient number, since it is larger than the sum of its proper divisors (1).

37691368913021 is an equidigital number, since it uses as much as digits as its factorization.

37691368913021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8817984, while the sum is 59.

The spelling of 37691368913021 in words is "thirty-seven trillion, six hundred ninety-one billion, three hundred sixty-eight million, nine hundred thirteen thousand, twenty-one".