669806791272 has 64 divisors (see below), whose sum is σ = 1863477417600. Its totient is φ = 222920570880.

The previous prime is 669806791217. The next prime is 669806791273. The reversal of 669806791272 is 272197608966.

669806791272 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 2×669806791272² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (669806791273) 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, 2280388 + ... + 2557299.

It is an arithmetic number, because the mean of its divisors is an integer number (29116834650).

Almost surely, 2^669806791272 is an apocalyptic number.

It is an amenable number.

669806791272 is an abundant number, since it is smaller than the sum of its proper divisors (1193670626328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669806791272 is a wasteful number, since it uses less digits than its factorization.

669806791272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4838343 (or 4838333 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 669806791272 in words is "six hundred sixty-nine billion, eight hundred six million, seven hundred ninety-one thousand, two hundred seventy-two".