18340687962781 has 4 divisors (see below), whose sum is σ = 18417427243200. Its totient is φ = 18263948682364.

The previous prime is 18340687962739. The next prime is 18340687962809. The reversal of 18340687962781 is 18726978604381.

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-18340687962781 is a prime.

It is a super-2 number, since 2×18340687962781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18340687962781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18340687962281) 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, 38369639851 + ... + 38369640328.

It is an arithmetic number, because the mean of its divisors is an integer number (4604356810800).

Almost surely, 2^{18340687962781} is an apocalyptic number.

It is an amenable number.

18340687962781 is a deficient number, since it is larger than the sum of its proper divisors (76739280419).

18340687962781 is an equidigital number, since it uses as much as digits as its factorization.

18340687962781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76739280418.

The product of its (nonzero) digits is 195084288, while the sum is 70.

The spelling of 18340687962781 in words is "eighteen trillion, three hundred forty billion, six hundred eighty-seven million, nine hundred sixty-two thousand, seven hundred eighty-one".