18871380967 has 4 divisors (see below), whose sum is σ = 18950340960. Its totient is φ = 18792420976.

The previous prime is 18871380953. The next prime is 18871381013. The reversal of 18871380967 is 76908317881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76908317881 = 22093 ⋅3481117.

It is a cyclic number.

It is not a de Polignac number, because 18871380967 - 2¹¹ = 18871378919 is a prime.

It is a super-2 number, since 2×18871380967² (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 (18871380937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39479638 + ... + 39480115.

It is an arithmetic number, because the mean of its divisors is an integer number (4737585240).

Almost surely, 2^18871380967 is an apocalyptic number.

18871380967 is a deficient number, since it is larger than the sum of its proper divisors (78959993).

18871380967 is an equidigital number, since it uses as much as digits as its factorization.

18871380967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78959992.

The product of its (nonzero) digits is 4064256, while the sum is 58.

The spelling of 18871380967 in words is "eighteen billion, eight hundred seventy-one million, three hundred eighty thousand, nine hundred sixty-seven".