669417765 has 16 divisors (see below), whose sum is σ = 1095978048. Its totient is φ = 348719616.

The previous prime is 669417739. The next prime is 669417769. The reversal of 669417765 is 567714966.

It is a happy number.

It is not a de Polignac number, because 669417765 - 2⁵ = 669417733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669417769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518284 + ... + 519573.

It is an arithmetic number, because the mean of its divisors is an integer number (68498628).

Almost surely, 2^669417765 is an apocalyptic number.

It is an amenable number.

669417765 is a deficient number, since it is larger than the sum of its proper divisors (426560283).

669417765 is a wasteful number, since it uses less digits than its factorization.

669417765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037908.

The product of its digits is 1905120, while the sum is 51.

The square root of 669417765 is about 25873.1089164020. The cubic root of 669417765 is about 874.7804684631.

The spelling of 669417765 in words is "six hundred sixty-nine million, four hundred seventeen thousand, seven hundred sixty-five".