669520650240 has 1680 divisors, whose sum is σ = 2791487836368. Its totient is φ = 152500174848.

The previous prime is 669520650191. The next prime is 669520650299. The reversal of 669520650240 is 42056025966.

It is a happy number.

669520650240 is a `hidden beast` number, since 6 + 69 + 520 + 65 + 0 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 15570247659 + ... + 15570247701.

Almost surely, 2^669520650240 is an apocalyptic number.

669520650240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669520650240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1395743918184).

669520650240 is an abundant number, since it is smaller than the sum of its proper divisors (2121967186128).

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

669520650240 is a wasteful number, since it uses less digits than its factorization.

669520650240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 669520650240 in words is "six hundred sixty-nine billion, five hundred twenty million, six hundred fifty thousand, two hundred forty".