1966690123 has 8 divisors (see below), whose sum is σ = 1993655808. Its totient is φ = 1939904064.

The previous prime is 1966690109. The next prime is 1966690139. The reversal of 1966690123 is 3210966691.

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

It is a cyclic number.

It is not a de Polignac number, because 1966690123 - 2⁹ = 1966689611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1966690123.

It is not an unprimeable number, because it can be changed into a prime (1966690723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22786 + ... + 66727.

It is an arithmetic number, because the mean of its divisors is an integer number (249206976).

Almost surely, 2^1966690123 is an apocalyptic number.

1966690123 is a deficient number, since it is larger than the sum of its proper divisors (26965685).

1966690123 is a wasteful number, since it uses less digits than its factorization.

1966690123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89813.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 1966690123 is about 44347.3801142751. The cubic root of 1966690123 is about 1252.8872189456.

The spelling of 1966690123 in words is "one billion, nine hundred sixty-six million, six hundred ninety thousand, one hundred twenty-three".