1966968878 has 24 divisors (see below), whose sum is σ = 3581388432. Its totient is φ = 806334144.

The previous prime is 1966968859. The next prime is 1966968889. The reversal of 1966968878 is 8788696691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434075 + ... + 438582.

It is an arithmetic number, because the mean of its divisors is an integer number (149224518).

Almost surely, 2^1966968878 is an apocalyptic number.

1966968878 is a deficient number, since it is larger than the sum of its proper divisors (1614419554).

1966968878 is a wasteful number, since it uses less digits than its factorization.

1966968878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872696 (or 872689 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 68.

The square root of 1966968878 is about 44350.5228605030. The cubic root of 1966968878 is about 1252.9464101171.

The spelling of 1966968878 in words is "one billion, nine hundred sixty-six million, nine hundred sixty-eight thousand, eight hundred seventy-eight".