961777777169 has 4 divisors (see below), whose sum is σ = 1049212120560. Its totient is φ = 874343433780.

The previous prime is 961777777159. The next prime is 961777777187.

961777777169 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961777777169 is a prime.

It is a super-2 number, since 2×961777777169² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 961777777096 and 961777777105.

It is not an unprimeable number, because it can be changed into a prime (961777777109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43717171679 + ... + 43717171700.

It is an arithmetic number, because the mean of its divisors is an integer number (262303030140).

Almost surely, 2^961777777169 is an apocalyptic number.

It is an amenable number.

961777777169 is a deficient number, since it is larger than the sum of its proper divisors (87434343391).

961777777169 is a wasteful number, since it uses less digits than its factorization.

961777777169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87434343390.

The product of its digits is 343064484, while the sum is 74.

The spelling of 961777777169 in words is "nine hundred sixty-one billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, one hundred sixty-nine".