7661727381 has 96 divisors (see below), whose sum is σ = 13274634240. Its totient is φ = 3844748160.

The previous prime is 7661727373. The next prime is 7661727383. The reversal of 7661727381 is 1837271667.

It is not a de Polignac number, because 7661727381 - 2³ = 7661727373 is a prime.

It is a super-2 number, since 2×7661727381² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7661727381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661727383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21341680 + ... + 21342038.

It is an arithmetic number, because the mean of its divisors is an integer number (138277440).

Almost surely, 2^7661727381 is an apocalyptic number.

It is an amenable number.

7661727381 is a deficient number, since it is larger than the sum of its proper divisors (5612906859).

7661727381 is a wasteful number, since it uses less digits than its factorization.

7661727381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 644 counting only the distinct ones).

The product of its digits is 592704, while the sum is 48.

The square root of 7661727381 is about 87531.2937240162. The cubic root of 7661727381 is about 1971.4036893077.

The spelling of 7661727381 in words is "seven billion, six hundred sixty-one million, seven hundred twenty-seven thousand, three hundred eighty-one".