669764973 has 4 divisors (see below), whose sum is σ = 893019968. Its totient is φ = 446509980.

The previous prime is 669764959. The next prime is 669764987. The reversal of 669764973 is 379467966.

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.

It is an interprime number because it is at equal distance from previous prime (669764959) and next prime (669764987).

It is not a de Polignac number, because 669764973 - 2⁴ = 669764957 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 (669764273) 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, 111627493 + ... + 111627498.

It is an arithmetic number, because the mean of its divisors is an integer number (223254992).

Almost surely, 2^669764973 is an apocalyptic number.

It is an amenable number.

669764973 is a deficient number, since it is larger than the sum of its proper divisors (223254995).

669764973 is a wasteful number, since it uses less digits than its factorization.

669764973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223254994.

The product of its digits is 10287648, while the sum is 57.

The square root of 669764973 is about 25879.8178703019. The cubic root of 669764973 is about 874.9316835914.

The spelling of 669764973 in words is "six hundred sixty-nine million, seven hundred sixty-four thousand, nine hundred seventy-three".