669551929 has 4 divisors (see below), whose sum is σ = 669674880. Its totient is φ = 669428980.

The previous prime is 669551923. The next prime is 669551947. The reversal of 669551929 is 929155966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 929155966 = 2 ⋅464577983.

It is a cyclic number.

It is not a de Polignac number, because 669551929 - 2⁹ = 669551417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669551923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52909 + ... + 64330.

It is an arithmetic number, because the mean of its divisors is an integer number (167418720).

Almost surely, 2^669551929 is an apocalyptic number.

It is an amenable number.

669551929 is a deficient number, since it is larger than the sum of its proper divisors (122951).

669551929 is a wasteful number, since it uses less digits than its factorization.

669551929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122950.

The product of its digits is 1312200, while the sum is 52.

The square root of 669551929 is about 25875.7015170604. The cubic root of 669551929 is about 874.8389054178.

The spelling of 669551929 in words is "six hundred sixty-nine million, five hundred fifty-one thousand, nine hundred twenty-nine".