15548849981 has 12 divisors (see below), whose sum is σ = 18145242972. Its totient is φ = 13284992448.

The previous prime is 15548849971. The next prime is 15548849983. The reversal of 15548849981 is 18994884551.

It can be written as a sum of positive squares in 2 ways, for example, as 5061041881 + 10487808100 = 71141^2 + 102410^2 .

It is not a de Polignac number, because 15548849981 - 2¹⁸ = 15548587837 is a prime.

It is a super-2 number, since 2×15548849981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15548849983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 491570 + ... + 522243.

It is an arithmetic number, because the mean of its divisors is an integer number (1512103581).

Almost surely, 2^15548849981 is an apocalyptic number.

It is an amenable number.

15548849981 is a deficient number, since it is larger than the sum of its proper divisors (2596392991).

15548849981 is a wasteful number, since it uses less digits than its factorization.

15548849981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014140 (or 1014133 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 62.

The spelling of 15548849981 in words is "fifteen billion, five hundred forty-eight million, eight hundred forty-nine thousand, nine hundred eighty-one".