6764721381 has 12 divisors (see below), whose sum is σ = 10659561120. Its totient is φ = 4099831080.

The previous prime is 6764721307. The next prime is 6764721407. The reversal of 6764721381 is 1831274676.

It is not a de Polignac number, because 6764721381 - 2²³ = 6756332773 is a prime.

It is a super-2 number, since 2×6764721381² = 91522910725117094322, 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 (6764721881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34165161 + ... + 34165358.

It is an arithmetic number, because the mean of its divisors is an integer number (888296760).

Almost surely, 2^6764721381 is an apocalyptic number.

It is an amenable number.

6764721381 is a deficient number, since it is larger than the sum of its proper divisors (3894839739).

6764721381 is a wasteful number, since it uses less digits than its factorization.

6764721381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68330536 (or 68330533 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 6764721381 is about 82247.9263021263. The cubic root of 6764721381 is about 1891.2544867107.

The spelling of 6764721381 in words is "six billion, seven hundred sixty-four million, seven hundred twenty-one thousand, three hundred eighty-one".