1821611746066 has 32 divisors (see below), whose sum is σ = 3197501733888. Its totient is φ = 762030113040.

The previous prime is 1821611746061. The next prime is 1821611746069. The reversal of 1821611746066 is 6606471161281.

It is not an unprimeable number, because it can be changed into a prime (1821611746061) 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, 91680 + ... + 1910923.

It is an arithmetic number, because the mean of its divisors is an integer number (99921929184).

Almost surely, 2^{1821611746066} is an apocalyptic number.

1821611746066 is a deficient number, since it is larger than the sum of its proper divisors (1375889987822).

1821611746066 is a wasteful number, since it uses less digits than its factorization.

1821611746066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004166.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 1821611746066 in words is "one trillion, eight hundred twenty-one billion, six hundred eleven million, seven hundred forty-six thousand, sixty-six".