669549157536 has 768 divisors, whose sum is σ = 2247475507200. Its totient is φ = 170243555328.

The previous prime is 669549157513. The next prime is 669549157547. The reversal of 669549157536 is 635751945966.

669549157536 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3398726590 + ... + 3398726786.

It is an arithmetic number, because the mean of its divisors is an integer number (2926400400).

Almost surely, 2^669549157536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669549157536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123737753600).

669549157536 is an abundant number, since it is smaller than the sum of its proper divisors (1577926349664).

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

669549157536 is a wasteful number, since it uses less digits than its factorization.

669549157536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 461 counting only the distinct ones).

The product of its digits is 183708000, while the sum is 66.

The spelling of 669549157536 in words is "six hundred sixty-nine billion, five hundred forty-nine million, one hundred fifty-seven thousand, five hundred thirty-six".