161662554 has 72 divisors (see below), whose sum is σ = 386201088. Its totient is φ = 50673600.

The previous prime is 161662541. The next prime is 161662577. The reversal of 161662554 is 455266161.

161662554 is a `hidden beast` number, since 16 + 16 + 625 + 5 + 4 = 666.

It is a super-2 number, since 2×161662554² = 52269562731605832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 139879 + ... + 141029.

It is an arithmetic number, because the mean of its divisors is an integer number (5363904).

Almost surely, 2^161662554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161662554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193100544).

161662554 is an abundant number, since it is smaller than the sum of its proper divisors (224538534).

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

161662554 is a wasteful number, since it uses less digits than its factorization.

161662554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1173 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 161662554 is about 12714.6590202018. The cubic root of 161662554 is about 544.7574085161.

The spelling of 161662554 in words is "one hundred sixty-one million, six hundred sixty-two thousand, five hundred fifty-four".