669787945 has 16 divisors (see below), whose sum is σ = 851218560. Its totient is φ = 504877824.

The previous prime is 669787933. The next prime is 669787961. The reversal of 669787945 is 549787966.

It is a cyclic number.

It is not a de Polignac number, because 669787945 - 2⁷ = 669787817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35760 + ... + 51169.

It is an arithmetic number, because the mean of its divisors is an integer number (53201160).

Almost surely, 2^669787945 is an apocalyptic number.

It is an amenable number.

669787945 is a deficient number, since it is larger than the sum of its proper divisors (181430615).

669787945 is a wasteful number, since it uses less digits than its factorization.

669787945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87024.

The product of its digits is 22861440, while the sum is 61.

The square root of 669787945 is about 25880.2616872396. The cubic root of 669787945 is about 874.9416864540.

The spelling of 669787945 in words is "six hundred sixty-nine million, seven hundred eighty-seven thousand, nine hundred forty-five".