1818781366526 has 32 divisors (see below), whose sum is σ = 2813455880928. Its totient is φ = 881300367360.

The previous prime is 1818781366481. The next prime is 1818781366529. The reversal of 1818781366526 is 6256631878181.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818781366529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23206766 + ... + 23285006.

It is an arithmetic number, because the mean of its divisors is an integer number (87920496279).

Almost surely, 2^{1818781366526} is an apocalyptic number.

1818781366526 is a deficient number, since it is larger than the sum of its proper divisors (994674514402).

1818781366526 is a wasteful number, since it uses less digits than its factorization.

1818781366526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80396.

The product of its digits is 23224320, while the sum is 62.

The spelling of 1818781366526 in words is "one trillion, eight hundred eighteen billion, seven hundred eighty-one million, three hundred sixty-six thousand, five hundred twenty-six".