2661659057 has 4 divisors (see below), whose sum is σ = 2662065780. Its totient is φ = 2661252336.

The previous prime is 2661659051. The next prime is 2661659081. The reversal of 2661659057 is 7509561662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148742416 + 2512916641 = 12196^2 + 50129^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661659057 - 2⁸ = 2661658801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661659051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193382 + ... + 206687.

It is an arithmetic number, because the mean of its divisors is an integer number (665516445).

Almost surely, 2^2661659057 is an apocalyptic number.

It is an amenable number.

2661659057 is a deficient number, since it is larger than the sum of its proper divisors (406723).

2661659057 is an equidigital number, since it uses as much as digits as its factorization.

2661659057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406722.

The product of its (nonzero) digits is 680400, while the sum is 47.

The square root of 2661659057 is about 51591.2691935370. The cubic root of 2661659057 is about 1385.8539841402.

The spelling of 2661659057 in words is "two billion, six hundred sixty-one million, six hundred fifty-nine thousand, fifty-seven".