66601692 has 54 divisors (see below), whose sum is σ = 171224144. Its totient is φ = 21828240.

The previous prime is 66601687. The next prime is 66601693. The reversal of 66601692 is 29610666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601693) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 181293 + ... + 181659.

Almost surely, 2^66601692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66601692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85612072).

66601692 is an abundant number, since it is smaller than the sum of its proper divisors (104622452).

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

66601692 is a wasteful number, since it uses less digits than its factorization.

66601692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 66601692 is about 8160.9859698446. The cubic root of 66601692 is about 405.3483605372.

The spelling of 66601692 in words is "sixty-six million, six hundred one thousand, six hundred ninety-two".