1665060261 has 16 divisors (see below), whose sum is σ = 2249069760. Its totient is φ = 1095572480.

The previous prime is 1665060217. The next prime is 1665060281. The reversal of 1665060261 is 1620605661.

It is a cyclic number.

It is not a de Polignac number, because 1665060261 - 2⁶ = 1665060197 is a prime.

It is a super-2 number, since 2×1665060261² = 5544851345522776242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665060281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303301 + ... + 308741.

It is an arithmetic number, because the mean of its divisors is an integer number (140566860).

Almost surely, 2^1665060261 is an apocalyptic number.

It is an amenable number.

1665060261 is a deficient number, since it is larger than the sum of its proper divisors (584009499).

1665060261 is a wasteful number, since it uses less digits than its factorization.

1665060261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 1665060261 is about 40805.1499323308. The cubic root of 1665060261 is about 1185.2500581444.

The spelling of 1665060261 in words is "one billion, six hundred sixty-five million, sixty thousand, two hundred sixty-one".