1655125657 has 4 divisors (see below), whose sum is σ = 1667760336. Its totient is φ = 1642490980.

The previous prime is 1655125639. The next prime is 1655125669. The reversal of 1655125657 is 7565215561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1655125657 - 2¹¹ = 1655123609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1655125607) 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, 6317143 + ... + 6317404.

It is an arithmetic number, because the mean of its divisors is an integer number (416940084).

Almost surely, 2^1655125657 is an apocalyptic number.

It is an amenable number.

1655125657 is a deficient number, since it is larger than the sum of its proper divisors (12634679).

1655125657 is a wasteful number, since it uses less digits than its factorization.

1655125657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12634678.

The product of its digits is 315000, while the sum is 43.

The square root of 1655125657 is about 40683.2355768319. The cubic root of 1655125657 is about 1182.8880842816. Note that the first 3 decimals are identical.

The spelling of 1655125657 in words is "one billion, six hundred fifty-five million, one hundred twenty-five thousand, six hundred fifty-seven".