66189950983 has 4 divisors (see below), whose sum is σ = 71281485688. Its totient is φ = 61098416280.

The previous prime is 66189950977. The next prime is 66189951007. The reversal of 66189950983 is 38905998166.

It is a happy number.

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 66189950983 - 2³³ = 57600016391 is a prime.

It is a super-2 number, since 2×66189950983² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66189920983) 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, 2545767333 + ... + 2545767358.

It is an arithmetic number, because the mean of its divisors is an integer number (17820371422).

Almost surely, 2^66189950983 is an apocalyptic number.

66189950983 is a deficient number, since it is larger than the sum of its proper divisors (5091534705).

66189950983 is a wasteful number, since it uses less digits than its factorization.

66189950983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5091534704.

The product of its (nonzero) digits is 25194240, while the sum is 64.

The spelling of 66189950983 in words is "sixty-six billion, one hundred eighty-nine million, nine hundred fifty thousand, nine hundred eighty-three".