1325157666 has 24 divisors (see below), whose sum is σ = 3083020560. Its totient is φ = 378616392.

The previous prime is 1325157661. The next prime is 1325157677. The reversal of 1325157666 is 6667515231.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1325157661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2253376 + ... + 2253963.

It is an arithmetic number, because the mean of its divisors is an integer number (128459190).

Almost surely, 2^1325157666 is an apocalyptic number.

1325157666 is an abundant number, since it is smaller than the sum of its proper divisors (1757862894).

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

1325157666 is a wasteful number, since it uses less digits than its factorization.

1325157666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507358 (or 4507351 counting only the distinct ones).

The product of its digits is 226800, while the sum is 42.

The square root of 1325157666 is about 36402.7150910478. The cubic root of 1325157666 is about 1098.3881809690.

The spelling of 1325157666 in words is "one billion, three hundred twenty-five million, one hundred fifty-seven thousand, six hundred sixty-six".