6542404991 has 2 divisors, whose sum is σ = 6542404992. Its totient is φ = 6542404990.

The previous prime is 6542404937. The next prime is 6542405003. The reversal of 6542404991 is 1994042456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6542404991 - 2⁶ = 6542404927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6542404091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271202495 + 3271202496.

It is an arithmetic number, because the mean of its divisors is an integer number (3271202496).

Almost surely, 2^6542404991 is an apocalyptic number.

6542404991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6542404991 is an equidigital number, since it uses as much as digits as its factorization.

6542404991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 6542404991 is about 80885.1345489392. The cubic root of 6542404991 is about 1870.3051720583.

The spelling of 6542404991 in words is "six billion, five hundred forty-two million, four hundred four thousand, nine hundred ninety-one".