66681468 has 60 divisors (see below), whose sum is σ = 199227952. Its totient is φ = 19051200.

The previous prime is 66681467. The next prime is 66681487. The reversal of 66681468 is 86418666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66681467) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12433 + ... + 16968.

Almost surely, 2^66681468 is an apocalyptic number.

It is an amenable number.

66681468 is an abundant number, since it is smaller than the sum of its proper divisors (132546484).

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

66681468 is a wasteful number, since it uses less digits than its factorization.

66681468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29424 (or 29413 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 66681468 is about 8165.8721518280. The cubic root of 66681468 is about 405.5101390507.

The spelling of 66681468 in words is "sixty-six million, six hundred eighty-one thousand, four hundred sixty-eight".