1325566640 has 20 divisors (see below), whose sum is σ = 3081942624. Its totient is φ = 530226624.

The previous prime is 1325566621. The next prime is 1325566703. The reversal of 1325566640 is 466655231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1325566594 and 1325566603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8284712 + ... + 8284871.

Almost surely, 2^1325566640 is an apocalyptic number.

1325566640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1325566640 is an abundant number, since it is smaller than the sum of its proper divisors (1756375984).

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

1325566640 is a wasteful number, since it uses less digits than its factorization.

1325566640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16569596 (or 16569590 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 1325566640 is about 36408.3320134279. The cubic root of 1325566640 is about 1098.5011652614.

The spelling of 1325566640 in words is "one billion, three hundred twenty-five million, five hundred sixty-six thousand, six hundred forty".