161557818854 has 8 divisors (see below), whose sum is σ = 247972466280. Its totient is φ = 78900330096.

The previous prime is 161557818841. The next prime is 161557818857. The reversal of 161557818854 is 458818755161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161557818854² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161557818793 and 161557818802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161557818857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939289559 + ... + 939289730.

It is an arithmetic number, because the mean of its divisors is an integer number (30996558285).

Almost surely, 2^161557818854 is an apocalyptic number.

161557818854 is a deficient number, since it is larger than the sum of its proper divisors (86414647426).

161557818854 is a wasteful number, since it uses less digits than its factorization.

161557818854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878579334.

The product of its digits is 10752000, while the sum is 59.

The spelling of 161557818854 in words is "one hundred sixty-one billion, five hundred fifty-seven million, eight hundred eighteen thousand, eight hundred fifty-four".