1626043540661 has 2 divisors, whose sum is σ = 1626043540662. Its totient is φ = 1626043540660.

The previous prime is 1626043540637. The next prime is 1626043540669. The reversal of 1626043540661 is 1660453406261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1515560428561 + 110483112100 = 1231081^2 + 332390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1626043540661 - 2³⁴ = 1608863671477 is a prime.

It is a super-2 number, since 2×1626043540661² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1626043540669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813021770330 + 813021770331.

It is an arithmetic number, because the mean of its divisors is an integer number (813021770331).

Almost surely, 2^{1626043540661} is an apocalyptic number.

It is an amenable number.

1626043540661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626043540661 is an equidigital number, since it uses as much as digits as its factorization.

1626043540661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 1626043540661 in words is "one trillion, six hundred twenty-six billion, forty-three million, five hundred forty thousand, six hundred sixty-one".