66233131500 has 48 divisors (see below), whose sum is σ = 192870883296. Its totient is φ = 17662168000.

The previous prime is 66233131477. The next prime is 66233131583. The reversal of 66233131500 is 513133266.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 22076211 + ... + 22079210.

It is an arithmetic number, because the mean of its divisors is an integer number (4018143402).

Almost surely, 2^66233131500 is an apocalyptic number.

66233131500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66233131500 is an abundant number, since it is smaller than the sum of its proper divisors (126637751796).

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

66233131500 is a wasteful number, since it uses less digits than its factorization.

66233131500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44155443 (or 44155431 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

Adding to 66233131500 its reverse (513133266), we get a palindrome (66746264766).

The spelling of 66233131500 in words is "sixty-six billion, two hundred thirty-three million, one hundred thirty-one thousand, five hundred".