61721472427 has 2 divisors, whose sum is σ = 61721472428. Its totient is φ = 61721472426.

The previous prime is 61721472401. The next prime is 61721472487. The reversal of 61721472427 is 72427412716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61721472427 - 2³¹ = 59573988779 is a prime.

It is not a weakly prime, because it can be changed into another prime (61721472487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30860736213 + 30860736214.

It is an arithmetic number, because the mean of its divisors is an integer number (30860736214).

Almost surely, 2^61721472427 is an apocalyptic number.

61721472427 is a deficient number, since it is larger than the sum of its proper divisors (1).

61721472427 is an equidigital number, since it uses as much as digits as its factorization.

61721472427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 263424, while the sum is 43.

The spelling of 61721472427 in words is "sixty-one billion, seven hundred twenty-one million, four hundred seventy-two thousand, four hundred twenty-seven".