16765215538 has 16 divisors (see below), whose sum is σ = 25364892960. Its totient is φ = 8310535200.

The previous prime is 16765215469. The next prime is 16765215541. The reversal of 16765215538 is 83551256761.

It is a junction number, because it is equal to n+sod(n) for n = 16765215491 and 16765215500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47758 + ... + 189238.

It is an arithmetic number, because the mean of its divisors is an integer number (1585305810).

Almost surely, 2^16765215538 is an apocalyptic number.

16765215538 is a deficient number, since it is larger than the sum of its proper divisors (8599677422).

16765215538 is a wasteful number, since it uses less digits than its factorization.

16765215538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141993.

The product of its digits is 1512000, while the sum is 49.

The spelling of 16765215538 in words is "sixteen billion, seven hundred sixty-five million, two hundred fifteen thousand, five hundred thirty-eight".