1966787109 has 64 divisors (see below), whose sum is σ = 3657830400. Its totient is φ = 1018391616.

The previous prime is 1966787101. The next prime is 1966787153. The reversal of 1966787109 is 9017876691.

It is not a de Polignac number, because 1966787109 - 2³ = 1966787101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966787101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70687 + ... + 94499.

It is an arithmetic number, because the mean of its divisors is an integer number (57153600).

Almost surely, 2^1966787109 is an apocalyptic number.

1966787109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1966787109 is a deficient number, since it is larger than the sum of its proper divisors (1691043291).

1966787109 is a wasteful number, since it uses less digits than its factorization.

1966787109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23871 (or 23865 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 1966787109 is about 44348.4735813985. The cubic root of 1966787109 is about 1252.9078137037.

The spelling of 1966787109 in words is "one billion, nine hundred sixty-six million, seven hundred eighty-seven thousand, one hundred nine".