1655625616 has 20 divisors (see below), whose sum is σ = 3212035612. Its totient is φ = 826713216.

The previous prime is 1655625599. The next prime is 1655625617. The reversal of 1655625616 is 6165265561.

It can be written as a sum of positive squares in 2 ways, for example, as 942735616 + 712890000 = 30704^2 + 26700^2 .

It is not an unprimeable number, because it can be changed into a prime (1655625617) 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, 56235 + ... + 80458.

Almost surely, 2^1655625616 is an apocalyptic number.

1655625616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1655625616 is a deficient number, since it is larger than the sum of its proper divisors (1556409996).

1655625616 is a wasteful number, since it uses less digits than its factorization.

1655625616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137458 (or 137452 counting only the distinct ones).

The product of its digits is 324000, while the sum is 43.

The square root of 1655625616 is about 40689.3796462910. The cubic root of 1655625616 is about 1183.0071761472.

The spelling of 1655625616 in words is "one billion, six hundred fifty-five million, six hundred twenty-five thousand, six hundred sixteen".