161655100 has 18 divisors (see below), whose sum is σ = 350791784. Its totient is φ = 64662000.

The previous prime is 161655089. The next prime is 161655107. The reversal of 161655100 is 1556161.

It is a super-2 number, since 2×161655100² = 52264742712020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161655107) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 808176 + ... + 808375.

Almost surely, 2^161655100 is an apocalyptic number.

161655100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161655100 is an abundant number, since it is smaller than the sum of its proper divisors (189136684).

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

161655100 is a wasteful number, since it uses less digits than its factorization.

161655100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616565 (or 1616558 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 161655100 is about 12714.3658905979. The cubic root of 161655100 is about 544.7490357585.

The spelling of 161655100 in words is "one hundred sixty-one million, six hundred fifty-five thousand, one hundred".