13448997891 has 80 divisors (see below), whose sum is σ = 24381333504. Its totient is φ = 7212208896.

The previous prime is 13448997853. The next prime is 13448997901. The reversal of 13448997891 is 19879984431.

13448997891 is a `hidden beast` number, since 13 + 448 + 9 + 97 + 8 + 91 = 666.

It is not a de Polignac number, because 13448997891 - 2²² = 13444803587 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (13448997091) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3689916 + ... + 3693558.

Almost surely, 2^13448997891 is an apocalyptic number.

13448997891 is a deficient number, since it is larger than the sum of its proper divisors (10932335613).

13448997891 is a wasteful number, since it uses less digits than its factorization.

13448997891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062 (or 4053 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The spelling of 13448997891 in words is "thirteen billion, four hundred forty-eight million, nine hundred ninety-seven thousand, eight hundred ninety-one".