371621621617 has 2 divisors, whose sum is σ = 371621621618. Its totient is φ = 371621621616.

The previous prime is 371621621543. The next prime is 371621621641. The reversal of 371621621617 is 716126126173.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366411091761 + 5210529856 = 605319^2 + 72184^2 .

It is a cyclic number.

It is not a de Polignac number, because 371621621617 - 2¹⁹ = 371621097329 is a prime.

It is not a weakly prime, because it can be changed into another prime (371621621017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 185810810808 + 185810810809.

It is an arithmetic number, because the mean of its divisors is an integer number (185810810809).

Almost surely, 2^371621621617 is an apocalyptic number.

It is an amenable number.

371621621617 is a deficient number, since it is larger than the sum of its proper divisors (1).

371621621617 is an equidigital number, since it uses as much as digits as its factorization.

371621621617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The spelling of 371621621617 in words is "three hundred seventy-one billion, six hundred twenty-one million, six hundred twenty-one thousand, six hundred seventeen".