1661433625 has 32 divisors (see below), whose sum is σ = 2193085440. Its totient is φ = 1253145600.

The previous prime is 1661433617. The next prime is 1661433629. The reversal of 1661433625 is 5263341661.

It is not a de Polignac number, because 1661433625 - 2³ = 1661433617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661433629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 528057 + ... + 531193.

It is an arithmetic number, because the mean of its divisors is an integer number (68533920).

Almost surely, 2^1661433625 is an apocalyptic number.

It is an amenable number.

1661433625 is a deficient number, since it is larger than the sum of its proper divisors (531651815).

1661433625 is a wasteful number, since it uses less digits than its factorization.

1661433625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394 (or 3384 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 1661433625 is about 40760.6872488676. The cubic root of 1661433625 is about 1184.3889091081.

The spelling of 1661433625 in words is "one billion, six hundred sixty-one million, four hundred thirty-three thousand, six hundred twenty-five".