15142662781 has 2 divisors, whose sum is σ = 15142662782. Its totient is φ = 15142662780.

The previous prime is 15142662779. The next prime is 15142662793. The reversal of 15142662781 is 18726624151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10486784025 + 4655878756 = 102405^2 + 68234^2 .

It is a cyclic number.

It is not a de Polignac number, because 15142662781 - 2¹ = 15142662779 is a prime.

It is a super-2 number, since 2×15142662781² (a number of 21 digits) contains 22 as substring.

Together with 15142662779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15142662751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7571331390 + 7571331391.

It is an arithmetic number, because the mean of its divisors is an integer number (7571331391).

Almost surely, 2^15142662781 is an apocalyptic number.

It is an amenable number.

15142662781 is a deficient number, since it is larger than the sum of its proper divisors (1).

15142662781 is an equidigital number, since it uses as much as digits as its factorization.

15142662781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The spelling of 15142662781 in words is "fifteen billion, one hundred forty-two million, six hundred sixty-two thousand, seven hundred eighty-one".