66131955 has 48 divisors (see below), whose sum is σ = 122451264. Its totient is φ = 32901120.

The previous prime is 66131929. The next prime is 66131957. The reversal of 66131955 is 55913166.

It is not a de Polignac number, because 66131955 - 2⁸ = 66131699 is a prime.

It is a super-3 number, since 3×66131955³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66131957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104490 + ... + 105120.

It is an arithmetic number, because the mean of its divisors is an integer number (2551068).

Almost surely, 2^66131955 is an apocalyptic number.

66131955 is a deficient number, since it is larger than the sum of its proper divisors (56319309).

66131955 is a wasteful number, since it uses less digits than its factorization.

66131955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796 (or 793 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 66131955 is about 8132.1556182847. The cubic root of 66131955 is about 404.3931469281.

The spelling of 66131955 in words is "sixty-six million, one hundred thirty-one thousand, nine hundred fifty-five".