966559781 has 16 divisors (see below), whose sum is σ = 1078671168. Its totient is φ = 858624000.

The previous prime is 966559739. The next prime is 966559787. The reversal of 966559781 is 187955669.

It is a cyclic number.

It is not a de Polignac number, because 966559781 - 2⁶ = 966559717 is a prime.

It is a super-2 number, since 2×966559781² = 1868475620493535922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (966559787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146606 + ... + 153056.

It is an arithmetic number, because the mean of its divisors is an integer number (67416948).

Almost surely, 2^966559781 is an apocalyptic number.

It is an amenable number.

966559781 is a deficient number, since it is larger than the sum of its proper divisors (112111387).

966559781 is a wasteful number, since it uses less digits than its factorization.

966559781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6772.

The product of its digits is 4082400, while the sum is 56.

The square root of 966559781 is about 31089.5445608327. The cubic root of 966559781 is about 988.7266494720.

The spelling of 966559781 in words is "nine hundred sixty-six million, five hundred fifty-nine thousand, seven hundred eighty-one".