1656897025 has 27 divisors (see below), whose sum is σ = 2392046211. Its totient is φ = 1135181040.

The previous prime is 1656897019. The next prime is 1656897091. The reversal of 1656897025 is 5207986561.

The square root of 1656897025 is 40705.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 596482929 + 1060414096 = 24423^2 + 32564^2 .

It is not a de Polignac number, because 1656897025 - 2¹⁹ = 1656372737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1656897025.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1424094 + ... + 1425256.

Almost surely, 2^1656897025 is an apocalyptic number.

1656897025 is the 40705-th square number.

1656897025 is the 20353-rd centered octagonal number.

It is an amenable number.

1656897025 is a deficient number, since it is larger than the sum of its proper divisors (735149186).

1656897025 is an frugal number, since it uses more digits than its factorization.

1656897025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350 (or 1175 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 49.

The cubic root of 1656897025 is about 1183.3099219508.

Multiplying 1656897025 by its sum of digits (49), we get a square (81187954225 = 284935²).

1656897025 divided by its sum of digits (49) gives a square (33814225 = 5815²).

The spelling of 1656897025 in words is "one billion, six hundred fifty-six million, eight hundred ninety-seven thousand, twenty-five".