669784395290 has 16 divisors (see below), whose sum is σ = 1206189626112. Its totient is φ = 267785377104.

The previous prime is 669784395277. The next prime is 669784395317. The reversal of 669784395290 is 92593487966.

669784395290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×669784395290² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 669784395290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16025714 + ... + 16067453.

It is an arithmetic number, because the mean of its divisors is an integer number (75386851632).

Almost surely, 2^669784395290 is an apocalyptic number.

669784395290 is a deficient number, since it is larger than the sum of its proper divisors (536405230822).

669784395290 is a wasteful number, since it uses less digits than its factorization.

669784395290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32095261.

The product of its (nonzero) digits is 176359680, while the sum is 68.

The spelling of 669784395290 in words is "six hundred sixty-nine billion, seven hundred eighty-four million, three hundred ninety-five thousand, two hundred ninety".