15511661616012 has 24 divisors (see below), whose sum is σ = 38098818004800. Its totient is φ = 4898419457616.

The previous prime is 15511661616007. The next prime is 15511661616013. The reversal of 15511661616012 is 21061616611551.

15511661616012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15511661616012² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15511661616013) 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, 34016801562 + ... + 34016802017.

It is an arithmetic number, because the mean of its divisors is an integer number (1587450750200).

Almost surely, 2^{15511661616012} is an apocalyptic number.

15511661616012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15511661616012 is an abundant number, since it is smaller than the sum of its proper divisors (22587156388788).

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

15511661616012 is a wasteful number, since it uses less digits than its factorization.

15511661616012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68033603605 (or 68033603603 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 42.

The spelling of 15511661616012 in words is "fifteen trillion, five hundred eleven billion, six hundred sixty-one million, six hundred sixteen thousand, twelve".