669891148 has 6 divisors (see below), whose sum is σ = 1172309516. Its totient is φ = 334945572.

The previous prime is 669891127. The next prime is 669891149. The reversal of 669891148 is 841198966.

It is a junction number, because it is equal to n+sod(n) for n = 669891095 and 669891104.

It is not an unprimeable number, because it can be changed into a prime (669891149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83736390 + ... + 83736397.

Almost surely, 2^669891148 is an apocalyptic number.

It is an amenable number.

669891148 is a deficient number, since it is larger than the sum of its proper divisors (502418368).

669891148 is a wasteful number, since it uses less digits than its factorization.

669891148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167472791 (or 167472789 counting only the distinct ones).

The product of its digits is 746496, while the sum is 52.

The square root of 669891148 is about 25882.2554658592. The cubic root of 669891148 is about 874.9866220540.

The spelling of 669891148 in words is "six hundred sixty-nine million, eight hundred ninety-one thousand, one hundred forty-eight".