161421463544 has 16 divisors (see below), whose sum is σ = 330180266520. Its totient is φ = 73373392480.

The previous prime is 161421463529. The next prime is 161421463549. The reversal of 161421463544 is 445364124161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161421463549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917167319 + ... + 917167494.

Almost surely, 2^161421463544 is an apocalyptic number.

It is an amenable number.

161421463544 is an abundant number, since it is smaller than the sum of its proper divisors (168758802976).

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

161421463544 is a wasteful number, since it uses less digits than its factorization.

161421463544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834334830 (or 1834334826 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The spelling of 161421463544 in words is "one hundred sixty-one billion, four hundred twenty-one million, four hundred sixty-three thousand, five hundred forty-four".