1325660643 has 6 divisors (see below), whose sum is σ = 1914843164. Its totient is φ = 883773756.

The previous prime is 1325660639. The next prime is 1325660659. The reversal of 1325660643 is 3460665231.

1325660643 is a `hidden beast` number, since 1 + 3 + 2 + 5 + 6 + 6 + 0 + 643 = 666.

It is not a de Polignac number, because 1325660643 - 2² = 1325660639 is a prime.

It is a super-2 number, since 2×1325660643² = 3514752280798346898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1325660598 and 1325660607.

It is not an unprimeable number, because it can be changed into a prime (1325660603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73647805 + ... + 73647822.

Almost surely, 2^1325660643 is an apocalyptic number.

1325660643 is a deficient number, since it is larger than the sum of its proper divisors (589182521).

1325660643 is a wasteful number, since it uses less digits than its factorization.

1325660643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147295633 (or 147295630 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 1325660643 is about 36409.6229450402. The cubic root of 1325660643 is about 1098.5271315063.

The spelling of 1325660643 in words is "one billion, three hundred twenty-five million, six hundred sixty thousand, six hundred forty-three".