66205692 has 72 divisors (see below), whose sum is σ = 194908896. Its totient is φ = 18555264.

The previous prime is 66205663. The next prime is 66205721. The reversal of 66205692 is 29650266.

It is an interprime number because it is at equal distance from previous prime (66205663) and next prime (66205721).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10878 + ... + 15834.

It is an arithmetic number, because the mean of its divisors is an integer number (2707068).

Almost surely, 2^66205692 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 66205692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97454448).

66205692 is an abundant number, since it is smaller than the sum of its proper divisors (128703204).

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

66205692 is a wasteful number, since it uses less digits than its factorization.

66205692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5027 (or 5022 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 66205692 is about 8136.6880240058. The cubic root of 66205692 is about 404.5433902899.

The spelling of 66205692 in words is "sixty-six million, two hundred five thousand, six hundred ninety-two".