13554771781 has 4 divisors (see below), whose sum is σ = 13573417312. Its totient is φ = 13536126252.

The previous prime is 13554771739. The next prime is 13554771799. The reversal of 13554771781 is 18717745531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13554771781 is a prime.

It is a super-2 number, since 2×13554771781² (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 (13554771701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9321675 + ... + 9323128.

It is an arithmetic number, because the mean of its divisors is an integer number (3393354328).

Almost surely, 2^13554771781 is an apocalyptic number.

It is an amenable number.

13554771781 is a deficient number, since it is larger than the sum of its proper divisors (18645531).

13554771781 is an equidigital number, since it uses as much as digits as its factorization.

13554771781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18645530.

The product of its digits is 823200, while the sum is 49.

The spelling of 13554771781 in words is "thirteen billion, five hundred fifty-four million, seven hundred seventy-one thousand, seven hundred eighty-one".