6616772381 has 4 divisors (see below), whose sum is σ = 6664375200. Its totient is φ = 6569169564.

The previous prime is 6616772329. The next prime is 6616772389. The reversal of 6616772381 is 1832776166.

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 a de Polignac number, because none of the positive numbers 2^k-6616772381 is a prime.

It is a super-2 number, since 2×6616772381² = 87563353483928818322, which 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 (6616772389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23801201 + ... + 23801478.

It is an arithmetic number, because the mean of its divisors is an integer number (1666093800).

Almost surely, 2^6616772381 is an apocalyptic number.

It is an amenable number.

6616772381 is a deficient number, since it is larger than the sum of its proper divisors (47602819).

6616772381 is a wasteful number, since it uses less digits than its factorization.

6616772381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47602818.

The product of its digits is 508032, while the sum is 47.

The square root of 6616772381 is about 81343.5454169536. The cubic root of 6616772381 is about 1877.3650635084.

The spelling of 6616772381 in words is "six billion, six hundred sixteen million, seven hundred seventy-two thousand, three hundred eighty-one".