1625497566 has 64 divisors (see below), whose sum is σ = 4068458496. Its totient is φ = 420616800.

The previous prime is 1625497499. The next prime is 1625497571. The reversal of 1625497566 is 6657945261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118711 + ... + 131693.

It is an arithmetic number, because the mean of its divisors is an integer number (63569664).

Almost surely, 2^1625497566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1625497566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2034229248).

1625497566 is an abundant number, since it is smaller than the sum of its proper divisors (2442960930).

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

1625497566 is a wasteful number, since it uses less digits than its factorization.

1625497566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13277.

The product of its digits is 2721600, while the sum is 51.

The square root of 1625497566 is about 40317.4598158168. The cubic root of 1625497566 is about 1175.7873258917.

The spelling of 1625497566 in words is "one billion, six hundred twenty-five million, four hundred ninety-seven thousand, five hundred sixty-six".