27780579451 has 2 divisors, whose sum is σ = 27780579452. Its totient is φ = 27780579450.

The previous prime is 27780579439. The next prime is 27780579503. The reversal of 27780579451 is 15497508772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27780579451 - 2¹¹ = 27780577403 is a prime.

It is a super-2 number, since 2×27780579451² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27780579392 and 27780579401.

It is not a weakly prime, because it can be changed into another prime (27780579401) 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, 13890289725 + 13890289726.

It is an arithmetic number, because the mean of its divisors is an integer number (13890289726).

Almost surely, 2^27780579451 is an apocalyptic number.

27780579451 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780579451 is an equidigital number, since it uses as much as digits as its factorization.

27780579451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4939200, while the sum is 55.

The spelling of 27780579451 in words is "twenty-seven billion, seven hundred eighty million, five hundred seventy-nine thousand, four hundred fifty-one".