66537131 has 2 divisors, whose sum is σ = 66537132. Its totient is φ = 66537130.

The previous prime is 66537109. The next prime is 66537139. The reversal of 66537131 is 13173566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66537131 - 2²² = 62342827 is a prime.

It is a super-2 number, since 2×66537131² = 8854379603422322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66537139) 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 as a sum of consecutive naturals, namely, 33268565 + 33268566.

It is an arithmetic number, because the mean of its divisors is an integer number (33268566).

Almost surely, 2^66537131 is an apocalyptic number.

66537131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66537131 is an equidigital number, since it uses as much as digits as its factorization.

66537131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 32.

The square root of 66537131 is about 8157.0295451224. The cubic root of 66537131 is about 405.2173420639.

The spelling of 66537131 in words is "sixty-six million, five hundred thirty-seven thousand, one hundred thirty-one".