66781606662 has 12 divisors (see below), whose sum is σ = 144693481140. Its totient is φ = 22260535548.

The previous prime is 66781606649. The next prime is 66781606673. The reversal of 66781606662 is 26660618766.

It is a junction number, because it is equal to n+sod(n) for n = 66781606599 and 66781606608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1855044612 + ... + 1855044647.

It is an arithmetic number, because the mean of its divisors is an integer number (12057790095).

Almost surely, 2^66781606662 is an apocalyptic number.

66781606662 is an abundant number, since it is smaller than the sum of its proper divisors (77911874478).

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

66781606662 is a wasteful number, since it uses less digits than its factorization.

66781606662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3710089267 (or 3710089264 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 66781606662 in words is "sixty-six billion, seven hundred eighty-one million, six hundred six thousand, six hundred sixty-two".