66219748359 has 4 divisors (see below), whose sum is σ = 88292997816. Its totient is φ = 44146498904.

The previous prime is 66219748349. The next prime is 66219748363. The reversal of 66219748359 is 95384791266.

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 66219748359 - 2⁸ = 66219748103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66219748349) 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, 11036624724 + ... + 11036624729.

It is an arithmetic number, because the mean of its divisors is an integer number (22073249454).

Almost surely, 2^66219748359 is an apocalyptic number.

66219748359 is a deficient number, since it is larger than the sum of its proper divisors (22073249457).

66219748359 is a wasteful number, since it uses less digits than its factorization.

66219748359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22073249456.

The product of its digits is 19595520, while the sum is 60.

The spelling of 66219748359 in words is "sixty-six billion, two hundred nineteen million, seven hundred forty-eight thousand, three hundred fifty-nine".