161245504 has 56 divisors (see below), whose sum is σ = 372636288. Its totient is φ = 67791360.

The previous prime is 161245499. The next prime is 161245531. The reversal of 161245504 is 405542161.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×161245504² = 52000225120428032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20349 + ... + 27139.

Almost surely, 2^161245504 is an apocalyptic number.

161245504 is a gapful number since it is divisible by the number (14) 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 161245504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186318144).

161245504 is an abundant number, since it is smaller than the sum of its proper divisors (211390784).

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

161245504 is an equidigital number, since it uses as much as digits as its factorization.

161245504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6863 (or 6853 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 161245504 is about 12698.2480681392. The cubic root of 161245504 is about 544.2885579836.

Adding to 161245504 its reverse (405542161), we get a palindrome (566787665).

The spelling of 161245504 in words is "one hundred sixty-one million, two hundred forty-five thousand, five hundred four".