3737720641021 has 2 divisors, whose sum is σ = 3737720641022. Its totient is φ = 3737720641020.

The previous prime is 3737720640893. The next prime is 3737720641027. The reversal of 3737720641021 is 1201460277373.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3181189720921 + 556530920100 = 1783589^2 + 746010^2 .

It is a cyclic number.

It is not a de Polignac number, because 3737720641021 - 2⁷ = 3737720640893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3737720641027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1868860320510 + 1868860320511.

It is an arithmetic number, because the mean of its divisors is an integer number (1868860320511).

Almost surely, 2^{3737720641021} is an apocalyptic number.

It is an amenable number.

3737720641021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3737720641021 is an equidigital number, since it uses as much as digits as its factorization.

3737720641021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 43.

The spelling of 3737720641021 in words is "three trillion, seven hundred thirty-seven billion, seven hundred twenty million, six hundred forty-one thousand, twenty-one".