668196561480 has 192 divisors, whose sum is σ = 2332344896640. Its totient is φ = 152699516928.

The previous prime is 668196561467. The next prime is 668196561493. The reversal of 668196561480 is 84165691866.

It is an interprime number because it is at equal distance from previous prime (668196561467) and next prime (668196561493).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41487109 + ... + 41503211.

It is an arithmetic number, because the mean of its divisors is an integer number (12147629670).

Almost surely, 2^668196561480 is an apocalyptic number.

668196561480 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 668196561480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166172448320).

668196561480 is an abundant number, since it is smaller than the sum of its proper divisors (1664148335160).

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

668196561480 is a wasteful number, since it uses less digits than its factorization.

668196561480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23188 (or 23177 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 668196561480 in words is "six hundred sixty-eight billion, one hundred ninety-six million, five hundred sixty-one thousand, four hundred eighty".