66618970537 has 4 divisors (see below), whose sum is σ = 76135966336. Its totient is φ = 57101974740.

The previous prime is 66618970493. The next prime is 66618970543. The reversal of 66618970537 is 73507981666.

It is a happy number.

66618970537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 66618970537 - 2²³ = 66610581929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66618970237) 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, 4758497889 + ... + 4758497902.

It is an arithmetic number, because the mean of its divisors is an integer number (19033991584).

Almost surely, 2^66618970537 is an apocalyptic number.

It is an amenable number.

66618970537 is a deficient number, since it is larger than the sum of its proper divisors (9516995799).

66618970537 is an equidigital number, since it uses as much as digits as its factorization.

66618970537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9516995798.

The product of its (nonzero) digits is 11430720, while the sum is 58.

The spelling of 66618970537 in words is "sixty-six billion, six hundred eighteen million, nine hundred seventy thousand, five hundred thirty-seven".