6624381381 has 8 divisors (see below), whose sum is σ = 9352067904. Its totient is φ = 4156474560.

The previous prime is 6624381367. The next prime is 6624381397. The reversal of 6624381381 is 1831834266.

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

It is not a de Polignac number, because 6624381381 - 2¹⁸ = 6624119237 is a prime.

It is a super-2 number, since 2×6624381381² = 87764857361878934322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6624381781) 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, 64944865 + ... + 64944966.

It is an arithmetic number, because the mean of its divisors is an integer number (1169008488).

Almost surely, 2^6624381381 is an apocalyptic number.

It is an amenable number.

6624381381 is a deficient number, since it is larger than the sum of its proper divisors (2727686523).

6624381381 is a wasteful number, since it uses less digits than its factorization.

6624381381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129889851.

The product of its digits is 165888, while the sum is 42.

The square root of 6624381381 is about 81390.3027454745. The cubic root of 6624381381 is about 1878.0844171843.

The spelling of 6624381381 in words is "six billion, six hundred twenty-four million, three hundred eighty-one thousand, three hundred eighty-one".