60666621 has 4 divisors (see below), whose sum is σ = 80888832. Its totient is φ = 40444412.

The previous prime is 60666611. The next prime is 60666623. The reversal of 60666621 is 12666606.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 60666621 - 2¹⁰ = 60665597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (60666623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10111101 + ... + 10111106.

It is an arithmetic number, because the mean of its divisors is an integer number (20222208).

Almost surely, 2^60666621 is an apocalyptic number.

It is an amenable number.

60666621 is a deficient number, since it is larger than the sum of its proper divisors (20222211).

60666621 is a wasteful number, since it uses less digits than its factorization.

60666621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20222210.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 60666621 is about 7788.8780321687. The cubic root of 60666621 is about 392.9312792193.

The spelling of 60666621 in words is "sixty million, six hundred sixty-six thousand, six hundred twenty-one".