1966342969 has 4 divisors (see below), whose sum is σ = 1986614644. Its totient is φ = 1946071296.

The previous prime is 1966342951. The next prime is 1966343011. The reversal of 1966342969 is 9692436691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9692436691 = 7 ⋅1384633813.

It can be written as a sum of positive squares in 2 ways, for example, as 290259369 + 1676083600 = 17037^2 + 40940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966342969 - 2¹⁵ = 1966310201 is a prime.

It is a super-2 number, since 2×1966342969² = 7733009343471469922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966342909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10135692 + ... + 10135885.

It is an arithmetic number, because the mean of its divisors is an integer number (496653661).

Almost surely, 2^1966342969 is an apocalyptic number.

It is an amenable number.

1966342969 is a deficient number, since it is larger than the sum of its proper divisors (20271675).

1966342969 is an equidigital number, since it uses as much as digits as its factorization.

1966342969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20271674.

The product of its digits is 3779136, while the sum is 55.

The square root of 1966342969 is about 44343.4659109998. The cubic root of 1966342969 is about 1252.8134960276.

The spelling of 1966342969 in words is "one billion, nine hundred sixty-six million, three hundred forty-two thousand, nine hundred sixty-nine".