13618761331 has 4 divisors (see below), whose sum is σ = 15564298672. Its totient is φ = 11673223992.

The previous prime is 13618761287. The next prime is 13618761361. The reversal of 13618761331 is 13316781631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13618761331 - 2⁷ = 13618761203 is a prime.

It is a super-2 number, since 2×13618761331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13618761361) 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, 972768660 + ... + 972768673.

It is an arithmetic number, because the mean of its divisors is an integer number (3891074668).

Almost surely, 2^13618761331 is an apocalyptic number.

13618761331 is a deficient number, since it is larger than the sum of its proper divisors (1945537341).

13618761331 is an equidigital number, since it uses as much as digits as its factorization.

13618761331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945537340.

The product of its digits is 54432, while the sum is 40.

The spelling of 13618761331 in words is "thirteen billion, six hundred eighteen million, seven hundred sixty-one thousand, three hundred thirty-one".