66368466990 has 960 divisors, whose sum is σ = 240267202560. Its totient is φ = 13011425280.

The previous prime is 66368466979. The next prime is 66368467037. The reversal of 66368466990 is 9966486366.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 397415887 + ... + 397416053.

It is an arithmetic number, because the mean of its divisors is an integer number (250278336).

Almost surely, 2^66368466990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66368466990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120133601280).

66368466990 is an abundant number, since it is smaller than the sum of its proper divisors (173898735570).

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

66368466990 is a wasteful number, since it uses less digits than its factorization.

66368466990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 63.

The spelling of 66368466990 in words is "sixty-six billion, three hundred sixty-eight million, four hundred sixty-six thousand, nine hundred ninety".