161854840611 has 24 divisors (see below), whose sum is σ = 238812874560. Its totient is φ = 105586056576.

The previous prime is 161854840607. The next prime is 161854840657. The reversal of 161854840611 is 116048458161.

161854840611 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 548 + 40 + 61 + 1 = 666.

It is not a de Polignac number, because 161854840611 - 2² = 161854840607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161854840811) 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, 2209671 + ... + 2281743.

It is an arithmetic number, because the mean of its divisors is an integer number (9950536440).

Almost surely, 2^161854840611 is an apocalyptic number.

161854840611 is a deficient number, since it is larger than the sum of its proper divisors (76958033949).

161854840611 is a wasteful number, since it uses less digits than its factorization.

161854840611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77435 (or 77432 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 161854840611 in words is "one hundred sixty-one billion, eight hundred fifty-four million, eight hundred forty thousand, six hundred eleven".