669157687 has 8 divisors (see below), whose sum is σ = 755162640. Its totient is φ = 587348160.

The previous prime is 669157667. The next prime is 669157693. The reversal of 669157687 is 786751966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669157687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669157667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1048518 + ... + 1049155.

It is an arithmetic number, because the mean of its divisors is an integer number (94395330).

Almost surely, 2^669157687 is an apocalyptic number.

669157687 is a deficient number, since it is larger than the sum of its proper divisors (86004953).

669157687 is a wasteful number, since it uses less digits than its factorization.

669157687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097713.

The product of its digits is 3810240, while the sum is 55.

The square root of 669157687 is about 25868.0823989719. The cubic root of 669157687 is about 874.6671657112.

The spelling of 669157687 in words is "six hundred sixty-nine million, one hundred fifty-seven thousand, six hundred eighty-seven".