2661676621 has 8 divisors (see below), whose sum is σ = 2819086200. Its totient is φ = 2504360448.

The previous prime is 2661676609. The next prime is 2661676627. The reversal of 2661676621 is 1266761662.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 541074121 + 2120602500 = 23261^2 + 46050^2 .

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 2661676621 - 2¹¹ = 2661674573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661676627) 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, 40305 + ... + 83353.

It is an arithmetic number, because the mean of its divisors is an integer number (352385775).

Almost surely, 2^2661676621 is an apocalyptic number.

It is an amenable number.

2661676621 is a deficient number, since it is larger than the sum of its proper divisors (157409579).

2661676621 is a wasteful number, since it uses less digits than its factorization.

2661676621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46703.

The product of its digits is 217728, while the sum is 43.

The square root of 2661676621 is about 51591.4394158566. The cubic root of 2661676621 is about 1385.8570325003.

The spelling of 2661676621 in words is "two billion, six hundred sixty-one million, six hundred seventy-six thousand, six hundred twenty-one".