16718748601 has 27 divisors (see below), whose sum is σ = 17870773743. Its totient is φ = 15640248960.

The previous prime is 16718748533. The next prime is 16718748619. The reversal of 16718748601 is 10684781761.

The square root of 16718748601 is 129301.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7507356025 + 9211392576 = 86645^2 + 95976^2 .

It is not a de Polignac number, because 16718748601 - 2⁹ = 16718748089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16718748661) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 172358185 + ... + 172358281.

It is an arithmetic number, because the mean of its divisors is an integer number (661880509).

Almost surely, 2^16718748601 is an apocalyptic number.

16718748601 is the 129301-st square number.

16718748601 is the 64651-st centered octagonal number.

It is an amenable number.

16718748601 is a deficient number, since it is larger than the sum of its proper divisors (1152025142).

16718748601 is an frugal number, since it uses more digits than its factorization.

16718748601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 49.

Multiplying 16718748601 by its sum of digits (49), we get a square (819218681449 = 905107²).

The spelling of 16718748601 in words is "sixteen billion, seven hundred eighteen million, seven hundred forty-eight thousand, six hundred one".