66899772 has 36 divisors (see below), whose sum is σ = 170058616. Its totient is φ = 22174560.

The previous prime is 66899719. The next prime is 66899797. The reversal of 66899772 is 27799866.

It is a tau number, because it is divible by the number of its divisors (36).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1383 + ... + 11649.

Almost surely, 2^66899772 is an apocalyptic number.

It is an amenable number.

66899772 is an abundant number, since it is smaller than the sum of its proper divisors (103158844).

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

66899772 is a wasteful number, since it uses less digits than its factorization.

66899772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10458 (or 10453 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 66899772 is about 8179.2280809377. The cubic root of 66899772 is about 405.9521811881.

It can be divided in two parts, 6689 and 9772, that added together give a palindrome (16461).

The spelling of 66899772 in words is "sixty-six million, eight hundred ninety-nine thousand, seven hundred seventy-two".