1066921979818 has 32 divisors (see below), whose sum is σ = 1695127294080. Its totient is φ = 502580643840.

The previous prime is 1066921979759. The next prime is 1066921979821. The reversal of 1066921979818 is 8189791296601.

It is a super-2 number, since 2×1066921979818² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26759578 + ... + 26799418.

It is an arithmetic number, because the mean of its divisors is an integer number (52972727940).

Almost surely, 2^{1066921979818} is an apocalyptic number.

1066921979818 is a deficient number, since it is larger than the sum of its proper divisors (628205314262).

1066921979818 is a wasteful number, since it uses less digits than its factorization.

1066921979818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48622.

The product of its (nonzero) digits is 23514624, while the sum is 67.

The spelling of 1066921979818 in words is "one trillion, sixty-six billion, nine hundred twenty-one million, nine hundred seventy-nine thousand, eight hundred eighteen".