669859140722 has 54 divisors (see below), whose sum is σ = 1087653372327. Its totient is φ = 309347923968.

The previous prime is 669859140701. The next prime is 669859140757. The reversal of 669859140722 is 227041958966.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 640158409801 + 29700730921 = 800099^2 + 172339^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=578731.

It is a super-2 number, since 2×669859140722² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1160934098 + ... + 1160934674.

Almost surely, 2^669859140722 is an apocalyptic number.

669859140722 is a deficient number, since it is larger than the sum of its proper divisors (417794231605).

669859140722 is an frugal number, since it uses more digits than its factorization.

669859140722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 669859140722 in words is "six hundred sixty-nine billion, eight hundred fifty-nine million, one hundred forty thousand, seven hundred twenty-two".