13449890378881 has 32 divisors (see below), whose sum is σ = 14831783769600. Its totient is φ = 12094882723200.

The previous prime is 13449890378851. The next prime is 13449890378927. The reversal of 13449890378881 is 18887309894431.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13449890378881 is a prime.

It is a super-2 number, since 2×13449890378881² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13449890378851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3189443085 + ... + 3189447301.

It is an arithmetic number, because the mean of its divisors is an integer number (463493242800).

Almost surely, 2^{13449890378881} is an apocalyptic number.

13449890378881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13449890378881 is a deficient number, since it is larger than the sum of its proper divisors (1381893390719).

13449890378881 is a wasteful number, since it uses less digits than its factorization.

13449890378881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7725.

The product of its (nonzero) digits is 334430208, while the sum is 73.

The spelling of 13449890378881 in words is "thirteen trillion, four hundred forty-nine billion, eight hundred ninety million, three hundred seventy-eight thousand, eight hundred eighty-one".