2621260666 has 8 divisors (see below), whose sum is σ = 3936449664. Its totient is φ = 1309110780.

The previous prime is 2621260639. The next prime is 2621260669. The reversal of 2621260666 is 6660621262.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2621260669) 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, 757620 + ... + 761071.

It is an arithmetic number, because the mean of its divisors is an integer number (492056208).

Almost surely, 2^2621260666 is an apocalyptic number.

2621260666 is a deficient number, since it is larger than the sum of its proper divisors (1315188998).

2621260666 is a wasteful number, since it uses less digits than its factorization.

2621260666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519556.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 2621260666 is about 51198.2486614533. The cubic root of 2621260666 is about 1378.8067585702.

The spelling of 2621260666 in words is "two billion, six hundred twenty-one million, two hundred sixty thousand, six hundred sixty-six".