70621166665549 has 2 divisors, whose sum is σ = 70621166665550. Its totient is φ = 70621166665548.

The previous prime is 70621166665507. The next prime is 70621166665561. The reversal of 70621166665549 is 94556666112607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43496267328900 + 27124899336649 = 6595170^2 + 5208157^2 .

It is a cyclic number.

It is not a de Polignac number, because 70621166665549 - 2⁹ = 70621166665037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70621166665649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35310583332774 + 35310583332775.

It is an arithmetic number, because the mean of its divisors is an integer number (35310583332775).

Almost surely, 2^{70621166665549} is an apocalyptic number.

It is an amenable number.

70621166665549 is a deficient number, since it is larger than the sum of its proper divisors (1).

70621166665549 is an equidigital number, since it uses as much as digits as its factorization.

70621166665549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97977600, while the sum is 64.

The spelling of 70621166665549 in words is "seventy trillion, six hundred twenty-one billion, one hundred sixty-six million, six hundred sixty-five thousand, five hundred forty-nine".