66637012371 has 4 divisors (see below), whose sum is σ = 88849349832. Its totient is φ = 44424674912.

The previous prime is 66637012279. The next prime is 66637012381. The reversal of 66637012371 is 17321073666.

It is a happy number.

66637012371 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.

It is a cyclic number.

It is not a de Polignac number, because 66637012371 - 2¹³ = 66637004179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66637012381) 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, 11106168726 + ... + 11106168731.

It is an arithmetic number, because the mean of its divisors is an integer number (22212337458).

Almost surely, 2^66637012371 is an apocalyptic number.

66637012371 is a deficient number, since it is larger than the sum of its proper divisors (22212337461).

66637012371 is a wasteful number, since it uses less digits than its factorization.

66637012371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22212337460.

The product of its (nonzero) digits is 190512, while the sum is 42.

The spelling of 66637012371 in words is "sixty-six billion, six hundred thirty-seven million, twelve thousand, three hundred seventy-one".