161630403440 has 40 divisors (see below), whose sum is σ = 409953480048. Its totient is φ = 58774691840.

The previous prime is 161630403433. The next prime is 161630403449. The reversal of 161630403440 is 44304036161.

161630403440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×161630403440² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161630403397 and 161630403406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161630403449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91834577 + ... + 91836336.

Almost surely, 2^161630403440 is an apocalyptic number.

161630403440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161630403440 is an abundant number, since it is smaller than the sum of its proper divisors (248323076608).

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

161630403440 is a wasteful number, since it uses less digits than its factorization.

161630403440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183670937 (or 183670931 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 161630403440 in words is "one hundred sixty-one billion, six hundred thirty million, four hundred three thousand, four hundred forty".