1966968890 has 16 divisors (see below), whose sum is σ = 3543288840. Its totient is φ = 786177600.

The previous prime is 1966968889. The next prime is 1966968907. The reversal of 1966968890 is 988696691.

It can be written as a sum of positive squares in 4 ways, for example, as 684397921 + 1282570969 = 26161^2 + 35813^2 .

It is a super-2 number, since 2×1966968890² = 7737933228455664200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62585 + ... + 88604.

Almost surely, 2^1966968890 is an apocalyptic number.

1966968890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1966968890 is a deficient number, since it is larger than the sum of its proper divisors (1576319950).

1966968890 is a wasteful number, since it uses less digits than its factorization.

1966968890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152497.

The product of its (nonzero) digits is 10077696, while the sum is 62.

The square root of 1966968890 is about 44350.5229957889. The cubic root of 1966968890 is about 1252.9464126651.

The spelling of 1966968890 in words is "one billion, nine hundred sixty-six million, nine hundred sixty-eight thousand, eight hundred ninety".