642621615737 has 2 divisors, whose sum is σ = 642621615738. Its totient is φ = 642621615736.

The previous prime is 642621615703. The next prime is 642621615763. The reversal of 642621615737 is 737516126246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501053038201 + 141568577536 = 707851^2 + 376256^2 .

It is a cyclic number.

It is not a de Polignac number, because 642621615737 - 2¹⁴ = 642621599353 is a prime.

It is not a weakly prime, because it can be changed into another prime (642621615637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321310807868 + 321310807869.

It is an arithmetic number, because the mean of its divisors is an integer number (321310807869).

Almost surely, 2^642621615737 is an apocalyptic number.

It is an amenable number.

642621615737 is a deficient number, since it is larger than the sum of its proper divisors (1).

642621615737 is an equidigital number, since it uses as much as digits as its factorization.

642621615737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 50.

The spelling of 642621615737 in words is "six hundred forty-two billion, six hundred twenty-one million, six hundred fifteen thousand, seven hundred thirty-seven".