66666654 has 12 divisors (see below), whose sum is σ = 144444456. Its totient is φ = 22222212.

The previous prime is 66666653. The next prime is 66666667. The reversal of 66666654 is 45666666.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1851834 + ... + 1851869.

It is an arithmetic number, because the mean of its divisors is an integer number (12037038).

Almost surely, 2^66666654 is an apocalyptic number.

66666654 is an abundant number, since it is smaller than the sum of its proper divisors (77777802).

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

66666654 is a wasteful number, since it uses less digits than its factorization.

66666654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703711 (or 3703708 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 66666654 is about 8164.9650336055. The cubic root of 66666654 is about 405.4801073578.

The spelling of 66666654 in words is "sixty-six million, six hundred sixty-six thousand, six hundred fifty-four".