1020191066 has 8 divisors (see below), whose sum is σ = 1556223840. Its totient is φ = 501449788.

The previous prime is 1020191057. The next prime is 1020191077. The reversal of 1020191066 is 6601910201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1020191066² = 2081579622292432712, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4322726 + ... + 4322961.

It is an arithmetic number, because the mean of its divisors is an integer number (194527980).

Almost surely, 2^1020191066 is an apocalyptic number.

1020191066 is a deficient number, since it is larger than the sum of its proper divisors (536032774).

1020191066 is an equidigital number, since it uses as much as digits as its factorization.

1020191066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8645748.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1020191066 is about 31940.4299595356. The cubic root of 1020191066 is about 1006.6855590264.

The spelling of 1020191066 in words is "one billion, twenty million, one hundred ninety-one thousand, sixty-six".