37287286721 has 2 divisors, whose sum is σ = 37287286722. Its totient is φ = 37287286720.

The previous prime is 37287286693. The next prime is 37287286723. The reversal of 37287286721 is 12768278273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36303586225 + 983700496 = 190535^2 + 31364^2 .

It is a cyclic number.

It is not a de Polignac number, because 37287286721 - 2²² = 37283092417 is a prime.

Together with 37287286723, 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 (37287286723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18643643360 + 18643643361.

It is an arithmetic number, because the mean of its divisors is an integer number (18643643361).

Almost surely, 2^37287286721 is an apocalyptic number.

It is an amenable number.

37287286721 is a deficient number, since it is larger than the sum of its proper divisors (1).

37287286721 is an equidigital number, since it uses as much as digits as its factorization.

37287286721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3161088, while the sum is 53.

The spelling of 37287286721 in words is "thirty-seven billion, two hundred eighty-seven million, two hundred eighty-six thousand, seven hundred twenty-one".