1966722407 has 4 divisors (see below), whose sum is σ = 2118008760. Its totient is φ = 1815436056.

The previous prime is 1966722361. The next prime is 1966722431. The reversal of 1966722407 is 7042276691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7042276691 = 2683 ⋅2624777.

It is a cyclic number.

It is not a de Polignac number, because 1966722407 - 2¹⁶ = 1966656871 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 (1966722467) 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 3 ways as a sum of consecutive naturals, for example, 75643157 + ... + 75643182.

It is an arithmetic number, because the mean of its divisors is an integer number (529502190).

Almost surely, 2^1966722407 is an apocalyptic number.

1966722407 is a deficient number, since it is larger than the sum of its proper divisors (151286353).

1966722407 is a wasteful number, since it uses less digits than its factorization.

1966722407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151286352.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 1966722407 is about 44347.7441027162. The cubic root of 1966722407 is about 1252.8940744553.

The spelling of 1966722407 in words is "one billion, nine hundred sixty-six million, seven hundred twenty-two thousand, four hundred seven".