1658668561 has 8 divisors (see below), whose sum is σ = 1827373248. Its totient is φ = 1492950000.

The previous prime is 1658668511. The next prime is 1658668567.

1658668561 is nontrivially palindromic in base 10.

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 1658668561 - 2⁷ = 1658668433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1658668499 and 1658668508.

It is not an unprimeable number, because it can be changed into a prime (1658668567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745365 + ... + 747586.

It is an arithmetic number, because the mean of its divisors is an integer number (228421656).

Almost surely, 2^1658668561 is an apocalyptic number.

1658668561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1658668561 is a deficient number, since it is larger than the sum of its proper divisors (168704687).

1658668561 is a wasteful number, since it uses less digits than its factorization.

1658668561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493063.

The product of its digits is 2073600, while the sum is 52.

The square root of 1658668561 is about 40726.7548547635. The cubic root of 1658668561 is about 1183.7314990379.

The spelling of 1658668561 in words is "one billion, six hundred fifty-eight million, six hundred sixty-eight thousand, five hundred sixty-one".