66516492 has 96 divisors (see below), whose sum is σ = 189665280. Its totient is φ = 17720640.

The previous prime is 66516481. The next prime is 66516493. The reversal of 66516492 is 29461566.

It is a self number, because there is not a number n which added to its sum of digits gives 66516492.

It is not an unprimeable number, because it can be changed into a prime (66516493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113023 + ... + 113609.

It is an arithmetic number, because the mean of its divisors is an integer number (1975680).

Almost surely, 2^66516492 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 66516492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94832640).

66516492 is an abundant number, since it is smaller than the sum of its proper divisors (123148788).

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

66516492 is a wasteful number, since it uses less digits than its factorization.

66516492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 689 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 66516492 is about 8155.7643418628. The cubic root of 66516492 is about 405.1754399185.

The spelling of 66516492 in words is "sixty-six million, five hundred sixteen thousand, four hundred ninety-two".