1621466460637 has 2 divisors, whose sum is σ = 1621466460638. Its totient is φ = 1621466460636.

The previous prime is 1621466460547. The next prime is 1621466460683. The reversal of 1621466460637 is 7360646641261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1305943842841 + 315522617796 = 1142779^2 + 561714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621466460637 - 2³⁹ = 1071710646749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621466460937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810733230318 + 810733230319.

It is an arithmetic number, because the mean of its divisors is an integer number (810733230319).

Almost surely, 2^{1621466460637} is an apocalyptic number.

It is an amenable number.

1621466460637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621466460637 is an equidigital number, since it uses as much as digits as its factorization.

1621466460637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 52.

The spelling of 1621466460637 in words is "one trillion, six hundred twenty-one billion, four hundred sixty-six million, four hundred sixty thousand, six hundred thirty-seven".