1620561412154 has 16 divisors (see below), whose sum is σ = 2502240142248. Its totient is φ = 786796588032.

The previous prime is 1620561412123. The next prime is 1620561412189. The reversal of 1620561412154 is 4512141650261.

It can be written as a sum of positive squares in 4 ways, for example, as 1588540099129 + 32021313025 = 1260373^2 + 178945^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78795467 + ... + 78816030.

Almost surely, 2^{1620561412154} is an apocalyptic number.

1620561412154 is a deficient number, since it is larger than the sum of its proper divisors (881678730094).

1620561412154 is a wasteful number, since it uses less digits than its factorization.

1620561412154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157611649.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 1620561412154 in words is "one trillion, six hundred twenty billion, five hundred sixty-one million, four hundred twelve thousand, one hundred fifty-four".