66101500 has 48 divisors (see below), whose sum is σ = 146424096. Its totient is φ = 26064000.

The previous prime is 66101479. The next prime is 66101509. The reversal of 66101500 is 510166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66101509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35595 + ... + 37405.

It is an arithmetic number, because the mean of its divisors is an integer number (3050502).

Almost surely, 2^66101500 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 66101500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73212048).

66101500 is an abundant number, since it is smaller than the sum of its proper divisors (80322596).

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

66101500 is a wasteful number, since it uses less digits than its factorization.

66101500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903 (or 1891 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 66101500 is about 8130.2828979071. The cubic root of 66101500 is about 404.3310605317.

Adding to 66101500 its reverse (510166), we get a palindrome (66611666).

The spelling of 66101500 in words is "sixty-six million, one hundred one thousand, five hundred".