27436153781 has 2 divisors, whose sum is σ = 27436153782. Its totient is φ = 27436153780.

The previous prime is 27436153763. The next prime is 27436153813. The reversal of 27436153781 is 18735163472.

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., 16188490756 + 11247663025 = 127234^2 + 106055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27436153781 is a prime.

It is a super-2 number, since 2×27436153781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27436153711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13718076890 + 13718076891.

It is an arithmetic number, because the mean of its divisors is an integer number (13718076891).

Almost surely, 2^27436153781 is an apocalyptic number.

It is an amenable number.

27436153781 is a deficient number, since it is larger than the sum of its proper divisors (1).

27436153781 is an equidigital number, since it uses as much as digits as its factorization.

27436153781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 47.

The spelling of 27436153781 in words is "twenty-seven billion, four hundred thirty-six million, one hundred fifty-three thousand, seven hundred eighty-one".