1817156117946 has 16 divisors (see below), whose sum is σ = 3913874715744. Its totient is φ = 559124959344.

The previous prime is 1817156117941. The next prime is 1817156117957. The reversal of 1817156117946 is 6497116517181.

It is not an unprimeable number, because it can be changed into a prime (1817156117941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11648436576 + ... + 11648436731.

It is an arithmetic number, because the mean of its divisors is an integer number (244617169734).

Almost surely, 2^{1817156117946} is an apocalyptic number.

1817156117946 is an abundant number, since it is smaller than the sum of its proper divisors (2096718597798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1817156117946 is a wasteful number, since it uses less digits than its factorization.

1817156117946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23296873325.

The product of its digits is 2540160, while the sum is 57.

The spelling of 1817156117946 in words is "one trillion, eight hundred seventeen billion, one hundred fifty-six million, one hundred seventeen thousand, nine hundred forty-six".