16506011555616 has 48 divisors (see below), whose sum is σ = 47267214912288. Its totient is φ = 5001821683200.

The previous prime is 16506011555611. The next prime is 16506011555633. The reversal of 16506011555616 is 61655511060561.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×16506011555616² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (16506011555611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7815345325 + ... + 7815347436.

It is an arithmetic number, because the mean of its divisors is an integer number (984733644006).

Almost surely, 2^{16506011555616} is an apocalyptic number.

16506011555616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16506011555616 is an abundant number, since it is smaller than the sum of its proper divisors (30761203356672).

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

16506011555616 is a wasteful number, since it uses less digits than its factorization.

16506011555616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15630692785 (or 15630692777 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 16506011555616 in words is "sixteen trillion, five hundred six billion, eleven million, five hundred fifty-five thousand, six hundred sixteen".