37969252721 has 2 divisors, whose sum is σ = 37969252722. Its totient is φ = 37969252720.

The previous prime is 37969252669. The next prime is 37969252723. The reversal of 37969252721 is 12725296973.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25118763121 + 12850489600 = 158489^2 + 113360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37969252721 is a prime.

Together with 37969252723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (37969252723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18984626360 + 18984626361.

It is an arithmetic number, because the mean of its divisors is an integer number (18984626361).

Almost surely, 2^37969252721 is an apocalyptic number.

It is an amenable number.

37969252721 is a deficient number, since it is larger than the sum of its proper divisors (1).

37969252721 is an equidigital number, since it uses as much as digits as its factorization.

37969252721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 53.

The spelling of 37969252721 in words is "thirty-seven billion, nine hundred sixty-nine million, two hundred fifty-two thousand, seven hundred twenty-one".