66157537 has 4 divisors (see below), whose sum is σ = 66267136. Its totient is φ = 66047940.

The previous prime is 66157501. The next prime is 66157541. The reversal of 66157537 is 73575166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66157537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66157537.

It is not an unprimeable number, because it can be changed into a prime (66157547) 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 3 ways as a sum of consecutive naturals, for example, 53889 + ... + 55102.

It is an arithmetic number, because the mean of its divisors is an integer number (16566784).

Almost surely, 2^66157537 is an apocalyptic number.

It is an amenable number.

66157537 is a deficient number, since it is larger than the sum of its proper divisors (109599).

66157537 is a wasteful number, since it uses less digits than its factorization.

66157537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109598.

The product of its digits is 132300, while the sum is 40.

The square root of 66157537 is about 8133.7283578934. The cubic root of 66157537 is about 404.4452843646.

The spelling of 66157537 in words is "sixty-six million, one hundred fifty-seven thousand, five hundred thirty-seven".