66731535 has 48 divisors (see below), whose sum is σ = 127973664. Its totient is φ = 31954176.

The previous prime is 66731519. The next prime is 66731549. The reversal of 66731535 is 53513766.

It is a happy number.

It is not a de Polignac number, because 66731535 - 2⁴ = 66731519 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66731535.

It is a congruent number.

It is an unprimeable number.

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, 20104 + ... + 23186.

It is an arithmetic number, because the mean of its divisors is an integer number (2666118).

Almost surely, 2^66731535 is an apocalyptic number.

66731535 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66731535 is a deficient number, since it is larger than the sum of its proper divisors (61242129).

66731535 is a wasteful number, since it uses less digits than its factorization.

66731535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144 (or 3141 counting only the distinct ones).

The product of its digits is 56700, while the sum is 36.

The square root of 66731535 is about 8168.9372013745. The cubic root of 66731535 is about 405.6116045079.

The spelling of 66731535 in words is "sixty-six million, seven hundred thirty-one thousand, five hundred thirty-five".