66615822 has 96 divisors (see below), whose sum is σ = 180590592. Its totient is φ = 17278272.

The previous prime is 66615793. The next prime is 66615823. The reversal of 66615822 is 22851666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66615823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109443 + ... + 110049.

It is an arithmetic number, because the mean of its divisors is an integer number (1881152).

Almost surely, 2^66615822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66615822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90295296).

66615822 is an abundant number, since it is smaller than the sum of its proper divisors (113974770).

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

66615822 is a wasteful number, since it uses less digits than its factorization.

66615822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702 (or 699 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 66615822 is about 8161.8516281540. The cubic root of 66615822 is about 405.3770243101.

The spelling of 66615822 in words is "sixty-six million, six hundred fifteen thousand, eight hundred twenty-two".