1620561412155 has 32 divisors (see below), whose sum is σ = 2989536321024. Its totient is φ = 734272068096.

The previous prime is 1620561412123. The next prime is 1620561412189. The reversal of 1620561412155 is 5512141650261.

It is not a de Polignac number, because 1620561412155 - 2⁵ = 1620561412123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68279809 + ... + 68303538.

It is an arithmetic number, because the mean of its divisors is an integer number (93423010032).

Almost surely, 2^{1620561412155} is an apocalyptic number.

1620561412155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1620561412155 is a deficient number, since it is larger than the sum of its proper divisors (1368974908869).

1620561412155 is a wasteful number, since it uses less digits than its factorization.

1620561412155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136583475.

The product of its (nonzero) digits is 72000, while the sum is 39.

The spelling of 1620561412155 in words is "one trillion, six hundred twenty billion, five hundred sixty-one million, four hundred twelve thousand, one hundred fifty-five".