66491103672 has 192 divisors, whose sum is σ = 218188339200. Its totient is φ = 17887599360.

The previous prime is 66491103667. The next prime is 66491103697. The reversal of 66491103672 is 27630119466.

66491103672 is a `hidden beast` number, since 66 + 491 + 1 + 0 + 36 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 520579 + ... + 635597.

It is an arithmetic number, because the mean of its divisors is an integer number (1136397600).

Almost surely, 2^66491103672 is an apocalyptic number.

66491103672 is a gapful number since it is divisible by the number (62) 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 66491103672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109094169600).

66491103672 is an abundant number, since it is smaller than the sum of its proper divisors (151697235528).

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

66491103672 is a wasteful number, since it uses less digits than its factorization.

66491103672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115106 (or 115099 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 66491103672 in words is "sixty-six billion, four hundred ninety-one million, one hundred three thousand, six hundred seventy-two".