669517293 has 4 divisors (see below), whose sum is σ = 892689728. Its totient is φ = 446344860.

The previous prime is 669517279. The next prime is 669517301. The reversal of 669517293 is 392715966.

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 not a de Polignac number, because 669517293 - 2¹³ = 669509101 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 (669517223) 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, 111586213 + ... + 111586218.

It is an arithmetic number, because the mean of its divisors is an integer number (223172432).

Almost surely, 2^669517293 is an apocalyptic number.

It is an amenable number.

669517293 is a deficient number, since it is larger than the sum of its proper divisors (223172435).

669517293 is a wasteful number, since it uses less digits than its factorization.

669517293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223172434.

The product of its digits is 612360, while the sum is 48.

The square root of 669517293 is about 25875.0322318640. The cubic root of 669517293 is about 874.8238199846.

The spelling of 669517293 in words is "six hundred sixty-nine million, five hundred seventeen thousand, two hundred ninety-three".