66869537 has 4 divisors (see below), whose sum is σ = 76422336. Its totient is φ = 57316740.

The previous prime is 66869519. The next prime is 66869549. The reversal of 66869537 is 73596866.

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-66869537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66869507) 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, 4776389 + ... + 4776402.

It is an arithmetic number, because the mean of its divisors is an integer number (19105584).

Almost surely, 2^66869537 is an apocalyptic number.

It is an amenable number.

66869537 is a deficient number, since it is larger than the sum of its proper divisors (9552799).

66869537 is an equidigital number, since it uses as much as digits as its factorization.

66869537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9552798.

The product of its digits is 1632960, while the sum is 50.

The square root of 66869537 is about 8177.3795925101. The cubic root of 66869537 is about 405.8910159886.

The spelling of 66869537 in words is "sixty-six million, eight hundred sixty-nine thousand, five hundred thirty-seven".