6340618381 has 2 divisors, whose sum is σ = 6340618382. Its totient is φ = 6340618380.

The previous prime is 6340618373. The next prime is 6340618409. The reversal of 6340618381 is 1838160436.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6309760356 + 30858025 = 79434^2 + 5555^2 .

It is a cyclic number.

It is not a de Polignac number, because 6340618381 - 2³ = 6340618373 is a prime.

It is a super-2 number, since 2×6340618381² = 80406882906950122322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6340618351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3170309190 + 3170309191.

It is an arithmetic number, because the mean of its divisors is an integer number (3170309191).

Almost surely, 2^6340618381 is an apocalyptic number.

It is an amenable number.

6340618381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6340618381 is an equidigital number, since it uses as much as digits as its factorization.

6340618381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 6340618381 is about 79627.9999811624. Note that the first 4 decimals coincide. The cubic root of 6340618381 is about 1850.8754931891.

The spelling of 6340618381 in words is "six billion, three hundred forty million, six hundred eighteen thousand, three hundred eighty-one".