1331665625 has 24 divisors (see below), whose sum is σ = 1670518080. Its totient is φ = 1061470000.

The previous prime is 1331665583. The next prime is 1331665627. The reversal of 1331665625 is 5265661331.

It is a de Polignac number, because none of the positive numbers 2^k-1331665625 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331665627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1121282 + ... + 1122468.

It is an arithmetic number, because the mean of its divisors is an integer number (69604920).

Almost surely, 2^1331665625 is an apocalyptic number.

It is an amenable number.

1331665625 is a deficient number, since it is larger than the sum of its proper divisors (338852455).

1331665625 is an frugal number, since it uses more digits than its factorization.

1331665625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1551 counting only the distinct ones).

The product of its digits is 97200, while the sum is 38.

The square root of 1331665625 is about 36491.9939849825. The cubic root of 1331665625 is about 1100.1833372100.

The spelling of 1331665625 in words is "one billion, three hundred thirty-one million, six hundred sixty-five thousand, six hundred twenty-five".