161551260 has 144 divisors (see below), whose sum is σ = 547493856. Its totient is φ = 39750912.

The previous prime is 161551253. The next prime is 161551279. The reversal of 161551260 is 62155161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61902 + ... + 64458.

Almost surely, 2^161551260 is an apocalyptic number.

161551260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161551260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273746928).

161551260 is an abundant number, since it is smaller than the sum of its proper divisors (385942596).

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

161551260 is a wasteful number, since it uses less digits than its factorization.

161551260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 2580 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 161551260 is about 12710.2816648570. The cubic root of 161551260 is about 544.6323699761.

The spelling of 161551260 in words is "one hundred sixty-one million, five hundred fifty-one thousand, two hundred sixty".