1620683929129 has 2 divisors, whose sum is σ = 1620683929130. Its totient is φ = 1620683929128.

The previous prime is 1620683929091. The next prime is 1620683929223. The reversal of 1620683929129 is 9219293860261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1334886769129 + 285797160000 = 1155373^2 + 534600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620683929129 - 2¹³ = 1620683920937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620683929729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810341964564 + 810341964565.

It is an arithmetic number, because the mean of its divisors is an integer number (810341964565).

Almost surely, 2^{1620683929129} is an apocalyptic number.

It is an amenable number.

1620683929129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620683929129 is an equidigital number, since it uses as much as digits as its factorization.

1620683929129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The spelling of 1620683929129 in words is "one trillion, six hundred twenty billion, six hundred eighty-three million, nine hundred twenty-nine thousand, one hundred twenty-nine".