66949902 has 56 divisors (see below), whose sum is σ = 153929376. Its totient is φ = 21819456.

The previous prime is 66949877. The next prime is 66949919. The reversal of 66949902 is 20994966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 68038 + ... + 69014.

Almost surely, 2^66949902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66949902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76964688).

66949902 is an abundant number, since it is smaller than the sum of its proper divisors (86979474).

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

66949902 is an equidigital number, since it uses as much as digits as its factorization.

66949902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1029 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 66949902 is about 8182.2919771907. The cubic root of 66949902 is about 406.0535532422.

The spelling of 66949902 in words is "sixty-six million, nine hundred forty-nine thousand, nine hundred two".