61571383873 has 2 divisors, whose sum is σ = 61571383874. Its totient is φ = 61571383872.

The previous prime is 61571383799. The next prime is 61571383879. The reversal of 61571383873 is 37838317516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61500032064 + 71351809 = 247992^2 + 8447^2 .

It is a cyclic number.

It is not a de Polignac number, because 61571383873 - 2⁹ = 61571383361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61571383873.

It is not a weakly prime, because it can be changed into another prime (61571383879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30785691936 + 30785691937.

It is an arithmetic number, because the mean of its divisors is an integer number (30785691937).

Almost surely, 2^61571383873 is an apocalyptic number.

It is an amenable number.

61571383873 is a deficient number, since it is larger than the sum of its proper divisors (1).

61571383873 is an equidigital number, since it uses as much as digits as its factorization.

61571383873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The spelling of 61571383873 in words is "sixty-one billion, five hundred seventy-one million, three hundred eighty-three thousand, eight hundred seventy-three".