61330230721 has 4 divisors (see below), whose sum is σ = 61342078000. Its totient is φ = 61318383444.

The previous prime is 61330230691. The next prime is 61330230749. The reversal of 61330230721 is 12703203316.

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 61330230721 - 2⁹ = 61330230209 is a prime.

It is a super-2 number, since 2×61330230721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61330230721.

It is not an unprimeable number, because it can be changed into a prime (61330237721) 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, 5915871 + ... + 5926228.

It is an arithmetic number, because the mean of its divisors is an integer number (15335519500).

Almost surely, 2^61330230721 is an apocalyptic number.

It is an amenable number.

61330230721 is a deficient number, since it is larger than the sum of its proper divisors (11847279).

61330230721 is a wasteful number, since it uses less digits than its factorization.

61330230721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11847278.

The product of its (nonzero) digits is 4536, while the sum is 28.

The spelling of 61330230721 in words is "sixty-one billion, three hundred thirty million, two hundred thirty thousand, seven hundred twenty-one".