1966611603 has 24 divisors (see below), whose sum is σ = 2881500480. Its totient is φ = 1183173120.

The previous prime is 1966611589. The next prime is 1966611643. The reversal of 1966611603 is 3061166691.

It is not a de Polignac number, because 1966611603 - 2⁵ = 1966611571 is a prime.

It is a super-2 number, since 2×1966611603² = 7735122394108459218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1966611643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3408051 + ... + 3408627.

It is an arithmetic number, because the mean of its divisors is an integer number (120062520).

Almost surely, 2^1966611603 is an apocalyptic number.

1966611603 is a deficient number, since it is larger than the sum of its proper divisors (914888877).

1966611603 is an equidigital number, since it uses as much as digits as its factorization.

1966611603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 1966611603 is about 44346.4948220262. The cubic root of 1966611603 is about 1252.8705449048.

The spelling of 1966611603 in words is "one billion, nine hundred sixty-six million, six hundred eleven thousand, six hundred three".