66250140391 has 8 divisors (see below), whose sum is σ = 66332052800. Its totient is φ = 66168264960.

The previous prime is 66250140361. The next prime is 66250140419. The reversal of 66250140391 is 19304105266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66250140391 - 2¹¹ = 66250138343 is a prime.

It is a super-2 number, since 2×66250140391² (a number of 22 digits) contains 22 as substring.

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 66250140391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66250140361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5406031 + ... + 5418271.

It is an arithmetic number, because the mean of its divisors is an integer number (8291506600).

Almost surely, 2^66250140391 is an apocalyptic number.

66250140391 is a deficient number, since it is larger than the sum of its proper divisors (81912409).

66250140391 is a wasteful number, since it uses less digits than its factorization.

66250140391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18489.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 66250140391 in words is "sixty-six billion, two hundred fifty million, one hundred forty thousand, three hundred ninety-one".