66109950 has 72 divisors (see below), whose sum is σ = 179405928. Its totient is φ = 17451840.

The previous prime is 66109943. The next prime is 66109951. The reversal of 66109950 is 5990166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66109951) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 47464 + ... + 48836.

It is an arithmetic number, because the mean of its divisors is an integer number (2491749).

Almost surely, 2^66109950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66109950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89702964).

66109950 is an abundant number, since it is smaller than the sum of its proper divisors (113295978).

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

66109950 is a wasteful number, since it uses less digits than its factorization.

66109950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 66109950 is about 8130.8025434148. The cubic root of 66109950 is about 404.3482888441.

The spelling of 66109950 in words is "sixty-six million, one hundred nine thousand, nine hundred fifty".