16561507201440 has 96 divisors (see below), whose sum is σ = 54914471277120. Its totient is φ = 4183959711744.

The previous prime is 16561507201433. The next prime is 16561507201471. The reversal of 16561507201440 is 4410270516561.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 16561507201392 and 16561507201401.

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, 907968249 + ... + 907986488.

It is an arithmetic number, because the mean of its divisors is an integer number (572025742470).

Almost surely, 2^{16561507201440} is an apocalyptic number.

16561507201440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16561507201440 is an abundant number, since it is smaller than the sum of its proper divisors (38352964075680).

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

16561507201440 is a wasteful number, since it uses less digits than its factorization.

16561507201440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815954774 (or 1815954766 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 16561507201440 in words is "sixteen trillion, five hundred sixty-one billion, five hundred seven million, two hundred one thousand, four hundred forty".