2566165501 has 8 divisors (see below), whose sum is σ = 2617087320. Its totient is φ = 2515336512.

The previous prime is 2566165489. The next prime is 2566165541. The reversal of 2566165501 is 1055616652.

It can be written as a sum of positive squares in 4 ways, for example, as 731756601 + 1834408900 = 27051^2 + 42830^2 .

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 2566165501 - 2⁷ = 2566165373 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 (2566165541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34011 + ... + 79303.

It is an arithmetic number, because the mean of its divisors is an integer number (327135915).

Almost surely, 2^2566165501 is an apocalyptic number.

It is an amenable number.

2566165501 is a deficient number, since it is larger than the sum of its proper divisors (50921819).

2566165501 is a wasteful number, since it uses less digits than its factorization.

2566165501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46415.

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 2566165501 is about 50657.3341284359. The cubic root of 2566165501 is about 1369.0780912906.

The spelling of 2566165501 in words is "two billion, five hundred sixty-six million, one hundred sixty-five thousand, five hundred one".