531378667161 has 24 divisors (see below), whose sum is σ = 782034256224. Its totient is φ = 347607152640.

The previous prime is 531378667159. The next prime is 531378667207. The reversal of 531378667161 is 161766873135.

531378667161 is a `hidden beast` number, since 53 + 1 + 378 + 6 + 67 + 161 = 666.

It is not a de Polignac number, because 531378667161 - 2¹ = 531378667159 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 531378667098 and 531378667107.

It is not an unprimeable number, because it can be changed into a prime (531378667661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1559475 + ... + 1869416.

It is an arithmetic number, because the mean of its divisors is an integer number (32584760676).

Almost surely, 2^531378667161 is an apocalyptic number.

It is an amenable number.

531378667161 is a deficient number, since it is larger than the sum of its proper divisors (250655589063).

531378667161 is a wasteful number, since it uses less digits than its factorization.

531378667161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3429221 (or 3429218 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The spelling of 531378667161 in words is "five hundred thirty-one billion, three hundred seventy-eight million, six hundred sixty-seven thousand, one hundred sixty-one".