1621366664767 has 2 divisors, whose sum is σ = 1621366664768. Its totient is φ = 1621366664766.

The previous prime is 1621366664741. The next prime is 1621366664789. The reversal of 1621366664767 is 7674666631261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621366664767 - 2⁷ = 1621366664639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621366661767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810683332383 + 810683332384.

It is an arithmetic number, because the mean of its divisors is an integer number (810683332384).

Almost surely, 2^{1621366664767} is an apocalyptic number.

1621366664767 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621366664767 is an equidigital number, since it uses as much as digits as its factorization.

1621366664767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 61.

The spelling of 1621366664767 in words is "one trillion, six hundred twenty-one billion, three hundred sixty-six million, six hundred sixty-four thousand, seven hundred sixty-seven".