66537953 has 4 divisors (see below), whose sum is σ = 66905748. Its totient is φ = 66170160.

The previous prime is 66537941. The next prime is 66537959. The reversal of 66537953 is 35973566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35973566 = 2 ⋅17986783.

It can be written as a sum of positive squares in 2 ways, for example, as 2024929 + 64513024 = 1423^2 + 8032^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66537953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66537959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183626 + ... + 183987.

It is an arithmetic number, because the mean of its divisors is an integer number (16726437).

Almost surely, 2^66537953 is an apocalyptic number.

It is an amenable number.

66537953 is a deficient number, since it is larger than the sum of its proper divisors (367795).

66537953 is a wasteful number, since it uses less digits than its factorization.

66537953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367794.

The product of its digits is 510300, while the sum is 44.

The square root of 66537953 is about 8157.0799309557. The cubic root of 66537953 is about 405.2190107426.

The spelling of 66537953 in words is "sixty-six million, five hundred thirty-seven thousand, nine hundred fifty-three".