6940218451 has 2 divisors, whose sum is σ = 6940218452. Its totient is φ = 6940218450.

The previous prime is 6940218449. The next prime is 6940218463. The reversal of 6940218451 is 1548120496.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6940218451 - 2¹ = 6940218449 is a prime.

Together with 6940218449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6940218751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3470109225 + 3470109226.

It is an arithmetic number, because the mean of its divisors is an integer number (3470109226).

Almost surely, 2^6940218451 is an apocalyptic number.

6940218451 is a deficient number, since it is larger than the sum of its proper divisors (1).

6940218451 is an equidigital number, since it uses as much as digits as its factorization.

6940218451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 6940218451 is about 83307.9735139440. The cubic root of 6940218451 is about 1907.4699880019.

The spelling of 6940218451 in words is "six billion, nine hundred forty million, two hundred eighteen thousand, four hundred fifty-one".