1620159025 has 6 divisors (see below), whose sum is σ = 2008997222. Its totient is φ = 1296127200.

The previous prime is 1620159019. The next prime is 1620159049. The reversal of 1620159025 is 5209510261.

It can be written as a sum of positive squares in 3 ways, for example, as 164660224 + 1455498801 = 12832^2 + 38151^2 .

It is not a de Polignac number, because 1620159025 - 2²⁷ = 1485941297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32403156 + ... + 32403205.

Almost surely, 2^1620159025 is an apocalyptic number.

It is an amenable number.

1620159025 is a deficient number, since it is larger than the sum of its proper divisors (388838197).

1620159025 is an equidigital number, since it uses as much as digits as its factorization.

1620159025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64806371 (or 64806366 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1620159025 is about 40251.1990504631. The cubic root of 1620159025 is about 1174.4987208356.

Adding to 1620159025 its reverse (5209510261), we get a palindrome (6829669286).

The spelling of 1620159025 in words is "one billion, six hundred twenty million, one hundred fifty-nine thousand, twenty-five".