161560440444 has 48 divisors (see below), whose sum is σ = 427339364480. Its totient is φ = 47094540480.

The previous prime is 161560440439. The next prime is 161560440451. The reversal of 161560440444 is 444044065161.

It is a super-2 number, since 2×161560440444² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27250822 + ... + 27256749.

Almost surely, 2^161560440444 is an apocalyptic number.

It is an amenable number.

161560440444 is an abundant number, since it is smaller than the sum of its proper divisors (265778924036).

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

161560440444 is a wasteful number, since it uses less digits than its factorization.

161560440444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54507610 (or 54507608 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The spelling of 161560440444 in words is "one hundred sixty-one billion, five hundred sixty million, four hundred forty thousand, four hundred forty-four".