66231500 has 48 divisors (see below), whose sum is σ = 149350656. Its totient is φ = 25632000.

The previous prime is 66231479. The next prime is 66231521. The reversal of 66231500 is 513266.

It is an interprime number because it is at equal distance from previous prime (66231479) and next prime (66231521).

It is a super-2 number, since 2×66231500² = 8773223184500000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13364 + ... + 17636.

It is an arithmetic number, because the mean of its divisors is an integer number (3111472).

Almost surely, 2^66231500 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 66231500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74675328).

66231500 is an abundant number, since it is smaller than the sum of its proper divisors (83119156).

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

66231500 is a wasteful number, since it uses less digits than its factorization.

66231500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323 (or 4311 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 66231500 is about 8138.2737727358. The cubic root of 66231500 is about 404.5959492123.

Adding to 66231500 its reverse (513266), we get a palindrome (66744766).

The spelling of 66231500 in words is "sixty-six million, two hundred thirty-one thousand, five hundred".