61005399971 has 2 divisors, whose sum is σ = 61005399972. Its totient is φ = 61005399970.

The previous prime is 61005399907. The next prime is 61005400009. The reversal of 61005399971 is 17999350016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61005399971 - 2⁶ = 61005399907 is a prime.

It is not a weakly prime, because it can be changed into another prime (61005392971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30502699985 + 30502699986.

It is an arithmetic number, because the mean of its divisors is an integer number (30502699986).

Almost surely, 2^61005399971 is an apocalyptic number.

61005399971 is a deficient number, since it is larger than the sum of its proper divisors (1).

61005399971 is an equidigital number, since it uses as much as digits as its factorization.

61005399971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 459270, while the sum is 50.

The spelling of 61005399971 in words is "sixty-one billion, five million, three hundred ninety-nine thousand, nine hundred seventy-one".