161554855540 has 48 divisors (see below), whose sum is σ = 367275525120. Its totient is φ = 59338696320.

The previous prime is 161554855463. The next prime is 161554855547. The reversal of 161554855540 is 45558455161.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161554855547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1576950 + ... + 1676269.

It is an arithmetic number, because the mean of its divisors is an integer number (7651573440).

Almost surely, 2^161554855540 is an apocalyptic number.

161554855540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161554855540 is an abundant number, since it is smaller than the sum of its proper divisors (205720669580).

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

161554855540 is a wasteful number, since it uses less digits than its factorization.

161554855540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253432 (or 3253430 counting only the distinct ones).

The product of its (nonzero) digits is 2400000, while the sum is 49.

The spelling of 161554855540 in words is "one hundred sixty-one billion, five hundred fifty-four million, eight hundred fifty-five thousand, five hundred forty".