665466455250 has 320 divisors, whose sum is σ = 1911529331712. Its totient is φ = 172677744000.

The previous prime is 665466455249. The next prime is 665466455281. The reversal of 665466455250 is 52554664566.

It is a happy number.

665466455250 is a `hidden beast` number, since 6 + 6 + 54 + 6 + 64 + 5 + 525 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 172264819 + ... + 172268681.

Almost surely, 2^665466455250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665466455250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955764665856).

665466455250 is an abundant number, since it is smaller than the sum of its proper divisors (1246062876462).

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

665466455250 is a wasteful number, since it uses less digits than its factorization.

665466455250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120 (or 4101 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 54.

The spelling of 665466455250 in words is "six hundred sixty-five billion, four hundred sixty-six million, four hundred fifty-five thousand, two hundred fifty".