61505434435331 has 2 divisors, whose sum is σ = 61505434435332. Its totient is φ = 61505434435330.

The previous prime is 61505434435321. The next prime is 61505434435369. The reversal of 61505434435331 is 13353443450516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61505434435331 - 2³⁴ = 61488254566147 is a prime.

It is a super-2 number, since 2×61505434435331² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61505434435321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30752717217665 + 30752717217666.

It is an arithmetic number, because the mean of its divisors is an integer number (30752717217666).

Almost surely, 2^{61505434435331} is an apocalyptic number.

61505434435331 is a deficient number, since it is larger than the sum of its proper divisors (1).

61505434435331 is an equidigital number, since it uses as much as digits as its factorization.

61505434435331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888000, while the sum is 47.

Adding to 61505434435331 its reverse (13353443450516), we get a palindrome (74858877885847).

The spelling of 61505434435331 in words is "sixty-one trillion, five hundred five billion, four hundred thirty-four million, four hundred thirty-five thousand, three hundred thirty-one".