61421216539 has 2 divisors, whose sum is σ = 61421216540. Its totient is φ = 61421216538.

The previous prime is 61421216509. The next prime is 61421216551. The reversal of 61421216539 is 93561212416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61421216539 - 2¹⁹ = 61420692251 is a prime.

It is a super-2 number, since 2×61421216539² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61421216509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30710608269 + 30710608270.

It is an arithmetic number, because the mean of its divisors is an integer number (30710608270).

Almost surely, 2^61421216539 is an apocalyptic number.

61421216539 is a deficient number, since it is larger than the sum of its proper divisors (1).

61421216539 is an equidigital number, since it uses as much as digits as its factorization.

61421216539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The spelling of 61421216539 in words is "sixty-one billion, four hundred twenty-one million, two hundred sixteen thousand, five hundred thirty-nine".