1629621562961 has 4 divisors (see below), whose sum is σ = 1862424643392. Its totient is φ = 1396818482532.

The previous prime is 1629621562957. The next prime is 1629621562967. The reversal of 1629621562961 is 1692651269261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1629621562961 - 2² = 1629621562957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1629621562897 and 1629621562906.

It is not an unprimeable number, because it can be changed into a prime (1629621562967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116401540205 + ... + 116401540218.

It is an arithmetic number, because the mean of its divisors is an integer number (465606160848).

Almost surely, 2^{1629621562961} is an apocalyptic number.

It is an amenable number.

1629621562961 is a deficient number, since it is larger than the sum of its proper divisors (232803080431).

1629621562961 is an equidigital number, since it uses as much as digits as its factorization.

1629621562961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232803080430.

The product of its digits is 4199040, while the sum is 56.

The spelling of 1629621562961 in words is "one trillion, six hundred twenty-nine billion, six hundred twenty-one million, five hundred sixty-two thousand, nine hundred sixty-one".