7681383737 has 2 divisors, whose sum is σ = 7681383738. Its totient is φ = 7681383736.

The previous prime is 7681383709. The next prime is 7681383769. The reversal of 7681383737 is 7373831867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7559259136 + 122124601 = 86944^2 + 11051^2 .

It is a cyclic number.

It is not a de Polignac number, because 7681383737 - 2²² = 7677189433 is a prime.

It is a super-2 number, since 2×7681383737² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7681383797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840691868 + 3840691869.

It is an arithmetic number, because the mean of its divisors is an integer number (3840691869).

Almost surely, 2^7681383737 is an apocalyptic number.

It is an amenable number.

7681383737 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681383737 is an equidigital number, since it uses as much as digits as its factorization.

7681383737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 53.

The square root of 7681383737 is about 87643.5036782533. The cubic root of 7681383737 is about 1973.0881450187.

The spelling of 7681383737 in words is "seven billion, six hundred eighty-one million, three hundred eighty-three thousand, seven hundred thirty-seven".