15742579981 has 2 divisors, whose sum is σ = 15742579982. Its totient is φ = 15742579980.

The previous prime is 15742579901. The next prime is 15742579997. The reversal of 15742579981 is 18997524751.

15742579981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15558570756 + 184009225 = 124734^2 + 13565^2 .

It is a cyclic number.

It is not a de Polignac number, because 15742579981 - 2²¹ = 15740482829 is a prime.

It is a super-2 number, since 2×15742579981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15742579901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7871289990 + 7871289991.

It is an arithmetic number, because the mean of its divisors is an integer number (7871289991).

Almost surely, 2^15742579981 is an apocalyptic number.

It is an amenable number.

15742579981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15742579981 is an equidigital number, since it uses as much as digits as its factorization.

15742579981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6350400, while the sum is 58.

The spelling of 15742579981 in words is "fifteen billion, seven hundred forty-two million, five hundred seventy-nine thousand, nine hundred eighty-one".