66233131501 has 16 divisors (see below), whose sum is σ = 67524233728. Its totient is φ = 64949040000.

The previous prime is 66233131477. The next prime is 66233131583. The reversal of 66233131501 is 10513133266.

It is a cyclic number.

It is not a de Polignac number, because 66233131501 - 2⁹ = 66233130989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66233131801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42924136 + ... + 42925678.

It is an arithmetic number, because the mean of its divisors is an integer number (4220264608).

Almost surely, 2^66233131501 is an apocalyptic number.

66233131501 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66233131501 is a deficient number, since it is larger than the sum of its proper divisors (1291102227).

66233131501 is a wasteful number, since it uses less digits than its factorization.

66233131501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292.

The product of its (nonzero) digits is 9720, while the sum is 31.

Adding to 66233131501 its reverse (10513133266), we get a palindrome (76746264767).

The spelling of 66233131501 in words is "sixty-six billion, two hundred thirty-three million, one hundred thirty-one thousand, five hundred one".