1966455687 has 16 divisors (see below), whose sum is σ = 3077491712. Its totient is φ = 1093318560.

The previous prime is 1966455649. The next prime is 1966455697. The reversal of 1966455687 is 7865546691.

It is not a de Polignac number, because 1966455687 - 2⁸ = 1966455431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966455697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1264639 + ... + 1266192.

It is an arithmetic number, because the mean of its divisors is an integer number (192343232).

Almost surely, 2^1966455687 is an apocalyptic number.

1966455687 is a deficient number, since it is larger than the sum of its proper divisors (1111036025).

1966455687 is a wasteful number, since it uses less digits than its factorization.

1966455687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2530878.

The product of its digits is 10886400, while the sum is 57.

The square root of 1966455687 is about 44344.7368579407. The cubic root of 1966455687 is about 1252.8374341936.

The spelling of 1966455687 in words is "one billion, nine hundred sixty-six million, four hundred fifty-five thousand, six hundred eighty-seven".