37720884521 has 2 divisors, whose sum is σ = 37720884522. Its totient is φ = 37720884520.

The previous prime is 37720884499. The next prime is 37720884541. The reversal of 37720884521 is 12548802773.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35498704921 + 2222179600 = 188411^2 + 47140^2 .

It is a cyclic number.

It is not a de Polignac number, because 37720884521 - 2⁶ = 37720884457 is a prime.

It is not a weakly prime, because it can be changed into another prime (37720884541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18860442260 + 18860442261.

It is an arithmetic number, because the mean of its divisors is an integer number (18860442261).

Almost surely, 2^37720884521 is an apocalyptic number.

It is an amenable number.

37720884521 is a deficient number, since it is larger than the sum of its proper divisors (1).

37720884521 is an equidigital number, since it uses as much as digits as its factorization.

37720884521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 37720884521 in words is "thirty-seven billion, seven hundred twenty million, eight hundred eighty-four thousand, five hundred twenty-one".