60666721 has 4 divisors (see below), whose sum is σ = 62623744. Its totient is φ = 58709700.

The previous prime is 60666719. The next prime is 60666733. The reversal of 60666721 is 12766606.

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 60666721 - 2¹ = 60666719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61666721) 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, 978465 + ... + 978526.

It is an arithmetic number, because the mean of its divisors is an integer number (15655936).

Almost surely, 2^60666721 is an apocalyptic number.

It is an amenable number.

60666721 is a deficient number, since it is larger than the sum of its proper divisors (1957023).

60666721 is a wasteful number, since it uses less digits than its factorization.

60666721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957022.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 60666721 is about 7788.8844515758. The cubic root of 60666721 is about 392.9314951157.

The spelling of 60666721 in words is "sixty million, six hundred sixty-six thousand, seven hundred twenty-one".