16667272505 has 8 divisors (see below), whose sum is σ = 21539244552. Its totient is φ = 12308139648.

The previous prime is 16667272499. The next prime is 16667272547. The reversal of 16667272505 is 50527276661.

It can be written as a sum of positive squares in 4 ways, for example, as 204304 + 16667068201 = 452^2 + 129101^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16667272505 - 2¹⁸ = 16667010361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16667272505.

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, 128209724 + ... + 128209853.

It is an arithmetic number, because the mean of its divisors is an integer number (2692405569).

Almost surely, 2^16667272505 is an apocalyptic number.

It is an amenable number.

16667272505 is a deficient number, since it is larger than the sum of its proper divisors (4871972047).

16667272505 is a wasteful number, since it uses less digits than its factorization.

16667272505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256419595.

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 16667272505 in words is "sixteen billion, six hundred sixty-seven million, two hundred seventy-two thousand, five hundred five".