2891662625 has 8 divisors (see below), whose sum is σ = 3608795112. Its totient is φ = 2313330000.

The previous prime is 2891662601. The next prime is 2891662643. The reversal of 2891662625 is 5262661982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9690769 + 2881971856 = 3113^2 + 53684^2 .

It is not a de Polignac number, because 2891662625 - 2⁶ = 2891662561 is a prime.

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 2891662625.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11566526 + ... + 11566775.

It is an arithmetic number, because the mean of its divisors is an integer number (451099389).

Almost surely, 2^2891662625 is an apocalyptic number.

2891662625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2891662625 is a deficient number, since it is larger than the sum of its proper divisors (717132487).

2891662625 is an equidigital number, since it uses as much as digits as its factorization.

2891662625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23133316 (or 23133306 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 2891662625 is about 53774.1817696932. The cubic root of 2891662625 is about 1424.6752312104.

The spelling of 2891662625 in words is "two billion, eight hundred ninety-one million, six hundred sixty-two thousand, six hundred twenty-five".