1011017215566 has 64 divisors (see below), whose sum is σ = 2367149091840. Its totient is φ = 319223630880.

The previous prime is 1011017215561. The next prime is 1011017215573. The reversal of 1011017215566 is 6655127101101.

1011017215566 is a `hidden beast` number, since 1 + 0 + 1 + 10 + 1 + 72 + 15 + 566 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011017215566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011017215561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3823645 + ... + 4079496.

It is an arithmetic number, because the mean of its divisors is an integer number (36986704560).

Almost surely, 2^{1011017215566} is an apocalyptic number.

1011017215566 is an abundant number, since it is smaller than the sum of its proper divisors (1356131876274).

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

1011017215566 is a wasteful number, since it uses less digits than its factorization.

1011017215566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7903278 (or 7903272 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The spelling of 1011017215566 in words is "one trillion, eleven billion, seventeen million, two hundred fifteen thousand, five hundred sixty-six".