161025500 has 24 divisors (see below), whose sum is σ = 351680784. Its totient is φ = 64410000.

The previous prime is 161025457. The next prime is 161025503. The reversal of 161025500 is 5520161.

161025500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161025503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160526 + ... + 161525.

It is an arithmetic number, because the mean of its divisors is an integer number (14653366).

Almost surely, 2^161025500 is an apocalyptic number.

161025500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161025500 is an abundant number, since it is smaller than the sum of its proper divisors (190655284).

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

161025500 is a wasteful number, since it uses less digits than its factorization.

161025500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322070 (or 322058 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 161025500 is about 12689.5823414327. The cubic root of 161025500 is about 544.0409021654.

Adding to 161025500 its reverse (5520161), we get a palindrome (166545661).

The spelling of 161025500 in words is "one hundred sixty-one million, twenty-five thousand, five hundred".