66981093438460 has 96 divisors (see below), whose sum is σ = 143653561793280. Its totient is φ = 26224709102592.

The previous prime is 66981093438421. The next prime is 66981093438499. The reversal of 66981093438460 is 6483439018966.

It is an interprime number because it is at equal distance from previous prime (66981093438421) and next prime (66981093438499).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3029573886 + ... + 3029595994.

It is an arithmetic number, because the mean of its divisors is an integer number (1496391268680).

Almost surely, 2^{66981093438460} is an apocalyptic number.

It is an amenable number.

66981093438460 is an abundant number, since it is smaller than the sum of its proper divisors (76672468354820).

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

66981093438460 is a wasteful number, since it uses less digits than its factorization.

66981093438460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28807 (or 28805 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 67.

The spelling of 66981093438460 in words is "sixty-six trillion, nine hundred eighty-one billion, ninety-three million, four hundred thirty-eight thousand, four hundred sixty".