27948939451 has 2 divisors, whose sum is σ = 27948939452. Its totient is φ = 27948939450.

The previous prime is 27948939427. The next prime is 27948939461. The reversal of 27948939451 is 15493984972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27948939451 - 2⁷ = 27948939323 is a prime.

It is a super-2 number, since 2×27948939451² (a number of 22 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 27948939451.

It is not a weakly prime, because it can be changed into another prime (27948939461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13974469725 + 13974469726.

It is an arithmetic number, because the mean of its divisors is an integer number (13974469726).

Almost surely, 2^27948939451 is an apocalyptic number.

27948939451 is a deficient number, since it is larger than the sum of its proper divisors (1).

27948939451 is an equidigital number, since it uses as much as digits as its factorization.

27948939451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 61.

The spelling of 27948939451 in words is "twenty-seven billion, nine hundred forty-eight million, nine hundred thirty-nine thousand, four hundred fifty-one".