1716525661 has 4 divisors (see below), whose sum is σ = 1718394400. Its totient is φ = 1714656924.

The previous prime is 1716525659. The next prime is 1716525697. The reversal of 1716525661 is 1665256171.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1665256171 = 31 ⋅53717941.

It is a cyclic number.

It is not a de Polignac number, because 1716525661 - 2¹ = 1716525659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1716525611) 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, 932991 + ... + 934828.

It is an arithmetic number, because the mean of its divisors is an integer number (429598600).

Almost surely, 2^1716525661 is an apocalyptic number.

It is an amenable number.

1716525661 is a deficient number, since it is larger than the sum of its proper divisors (1868739).

1716525661 is an equidigital number, since it uses as much as digits as its factorization.

1716525661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868738.

The product of its digits is 75600, while the sum is 40.

The square root of 1716525661 is about 41430.9746566503. The cubic root of 1716525661 is about 1197.3380021822.

The spelling of 1716525661 in words is "one billion, seven hundred sixteen million, five hundred twenty-five thousand, six hundred sixty-one".