2521666101 has 8 divisors (see below), whose sum is σ = 3362494464. Its totient is φ = 1680974240.

The previous prime is 2521666067. The next prime is 2521666109. The reversal of 2521666101 is 1016661252.

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 2521666101 - 2⁹ = 2521665589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521666109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22321 + ... + 74441.

It is an arithmetic number, because the mean of its divisors is an integer number (420311808).

Almost surely, 2^2521666101 is an apocalyptic number.

It is an amenable number.

2521666101 is a deficient number, since it is larger than the sum of its proper divisors (840828363).

2521666101 is a wasteful number, since it uses less digits than its factorization.

2521666101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68251.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 2521666101 is about 50216.1936132160. The cubic root of 2521666101 is about 1361.1182593615.

The spelling of 2521666101 in words is "two billion, five hundred twenty-one million, six hundred sixty-six thousand, one hundred one".