161043979854 has 16 divisors (see below), whose sum is σ = 322337462400. Its totient is φ = 53639742840.

The previous prime is 161043979849. The next prime is 161043979867. The reversal of 161043979854 is 458979340161.

It is a happy number.

It is a super-2 number, since 2×161043979854² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161043979794 and 161043979803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10387554 + ... + 10403045.

It is an arithmetic number, because the mean of its divisors is an integer number (20146091400).

Almost surely, 2^161043979854 is an apocalyptic number.

161043979854 is an abundant number, since it is smaller than the sum of its proper divisors (161293482546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161043979854 is a wasteful number, since it uses less digits than its factorization.

161043979854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20791895.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 161043979854 in words is "one hundred sixty-one billion, forty-three million, nine hundred seventy-nine thousand, eight hundred fifty-four".