966397781787 has 4 divisors (see below), whose sum is σ = 1288530375720. Its totient is φ = 644265187856.

The previous prime is 966397781749. The next prime is 966397781837. The reversal of 966397781787 is 787187793669.

966397781787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-966397781787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (966397781747) 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, 161066296962 + ... + 161066296967.

It is an arithmetic number, because the mean of its divisors is an integer number (322132593930).

Almost surely, 2^966397781787 is an apocalyptic number.

966397781787 is a deficient number, since it is larger than the sum of its proper divisors (322132593933).

966397781787 is a wasteful number, since it uses less digits than its factorization.

966397781787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322132593932.

The product of its digits is 1344252672, while the sum is 78.

The spelling of 966397781787 in words is "nine hundred sixty-six billion, three hundred ninety-seven million, seven hundred eighty-one thousand, seven hundred eighty-seven".