669356544 has 40 divisors (see below), whose sum is σ = 1783211760. Its totient is φ = 223118336.

The previous prime is 669356543. The next prime is 669356573. The reversal of 669356544 is 445653966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 669356493 and 669356502.

It is not an unprimeable number, because it can be changed into a prime (669356543) 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, 216354 + ... + 219425.

It is an arithmetic number, because the mean of its divisors is an integer number (44580294).

Almost surely, 2^669356544 is an apocalyptic number.

669356544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

669356544 is an abundant number, since it is smaller than the sum of its proper divisors (1113855216).

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

669356544 is an equidigital number, since it uses as much as digits as its factorization.

669356544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435800 (or 435784 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 48.

The square root of 669356544 is about 25871.9257883908. The cubic root of 669356544 is about 874.7538002296.

The spelling of 669356544 in words is "six hundred sixty-nine million, three hundred fifty-six thousand, five hundred forty-four".