60661721 has 4 divisors (see below), whose sum is σ = 60733200. Its totient is φ = 60590244.

The previous prime is 60661717. The next prime is 60661751. The reversal of 60661721 is 12716606.

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 60661721 - 2² = 60661717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (60661751) 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, 34451 + ... + 36168.

It is an arithmetic number, because the mean of its divisors is an integer number (15183300).

Almost surely, 2^60661721 is an apocalyptic number.

It is an amenable number.

60661721 is a deficient number, since it is larger than the sum of its proper divisors (71479).

60661721 is an equidigital number, since it uses as much as digits as its factorization.

60661721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71478.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 60661721 is about 7788.5634747365. The cubic root of 60661721 is about 392.9207000075.

The spelling of 60661721 in words is "sixty million, six hundred sixty-one thousand, seven hundred twenty-one".