161225782000 has 40 divisors (see below), whose sum is σ = 389843945712. Its totient is φ = 64490312000.

The previous prime is 161225781953. The next prime is 161225782009. The reversal of 161225782000 is 287522161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161225782009) 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, 40304446 + ... + 40308445.

Almost surely, 2^161225782000 is an apocalyptic number.

161225782000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161225782000 is an abundant number, since it is smaller than the sum of its proper divisors (228618163712).

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

161225782000 is an equidigital number, since it uses as much as digits as its factorization.

161225782000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80612914 (or 80612898 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 161225782000 in words is "one hundred sixty-one billion, two hundred twenty-five million, seven hundred eighty-two thousand".