161725680808440 has 128 divisors (see below), whose sum is σ = 559978029457920. Its totient is φ = 36599871168000.

The previous prime is 161725680808429. The next prime is 161725680808519. The reversal of 161725680808440 is 44808086527161.

It is a happy number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 953036806 + ... + 953206485.

It is an arithmetic number, because the mean of its divisors is an integer number (4374828355140).

Almost surely, 2^{161725680808440} is an apocalyptic number.

161725680808440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161725680808440 is an abundant number, since it is smaller than the sum of its proper divisors (398252348649480).

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

161725680808440 is a wasteful number, since it uses less digits than its factorization.

161725680808440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906243413 (or 1906243409 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 60.

The spelling of 161725680808440 in words is "one hundred sixty-one trillion, seven hundred twenty-five billion, six hundred eighty million, eight hundred eight thousand, four hundred forty".