16215515612 has 12 divisors (see below), whose sum is σ = 28383257616. Its totient is φ = 8106013440.

The previous prime is 16215515611. The next prime is 16215515651. The reversal of 16215515612 is 21651551261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16215515611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415064 + ... + 452447.

It is an arithmetic number, because the mean of its divisors is an integer number (2365271468).

Almost surely, 2^16215515612 is an apocalyptic number.

It is an amenable number.

16215515612 is a deficient number, since it is larger than the sum of its proper divisors (12167742004).

16215515612 is a wasteful number, since it uses less digits than its factorization.

16215515612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872188 (or 872186 counting only the distinct ones).

The product of its digits is 18000, while the sum is 35.

The spelling of 16215515612 in words is "sixteen billion, two hundred fifteen million, five hundred fifteen thousand, six hundred twelve".