1726066561 has 4 divisors (see below), whose sum is σ = 1726354224. Its totient is φ = 1725778900.

The previous prime is 1726066543. The next prime is 1726066567. The reversal of 1726066561 is 1656606271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1726066561 - 2¹¹ = 1726064513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1726066567) 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, 134635 + ... + 146896.

It is an arithmetic number, because the mean of its divisors is an integer number (431588556).

Almost surely, 2^1726066561 is an apocalyptic number.

It is an amenable number.

1726066561 is a deficient number, since it is larger than the sum of its proper divisors (287663).

1726066561 is an equidigital number, since it uses as much as digits as its factorization.

1726066561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287662.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1726066561 is about 41545.9572160758. The cubic root of 1726066561 is about 1199.5522776506.

The spelling of 1726066561 in words is "one billion, seven hundred twenty-six million, sixty-six thousand, five hundred sixty-one".