1620256130544 has 20 divisors (see below), whose sum is σ = 4185661670696. Its totient is φ = 540085376832.

The previous prime is 1620256130509. The next prime is 1620256130557. The reversal of 1620256130544 is 4450316520261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16877667979 + ... + 16877668074.

Almost surely, 2^{1620256130544} is an apocalyptic number.

It is an amenable number.

1620256130544 is an abundant number, since it is smaller than the sum of its proper divisors (2565405540152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620256130544 is a wasteful number, since it uses less digits than its factorization.

1620256130544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33755336064 (or 33755336058 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 1620256130544 in words is "one trillion, six hundred twenty billion, two hundred fifty-six million, one hundred thirty thousand, five hundred forty-four".