865781141978 has 4 divisors (see below), whose sum is σ = 1298671712970. Its totient is φ = 432890570988.

The previous prime is 865781141977. The next prime is 865781141983. The reversal of 865781141978 is 879141187568.

865781141978 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 can be written as a sum of positive squares in only one way, i.e., 865426460089 + 354681889 = 930283^2 + 18833^2 .

It is not an unprimeable number, because it can be changed into a prime (865781141977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216445285493 + ... + 216445285496.

Almost surely, 2^865781141978 is an apocalyptic number.

865781141978 is a deficient number, since it is larger than the sum of its proper divisors (432890570992).

865781141978 is a wasteful number, since it uses less digits than its factorization.

865781141978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432890570991.

The product of its digits is 27095040, while the sum is 65.

The spelling of 865781141978 in words is "eight hundred sixty-five billion, seven hundred eighty-one million, one hundred forty-one thousand, nine hundred seventy-eight".