61081724369 has 2 divisors, whose sum is σ = 61081724370. Its totient is φ = 61081724368.

The previous prime is 61081724339. The next prime is 61081724371. The reversal of 61081724369 is 96342718016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38374851025 + 22706873344 = 195895^2 + 150688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61081724369 is a prime.

It is a super-2 number, since 2×61081724369² (a number of 22 digits) contains 22 as substring.

Together with 61081724371, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61081724339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30540862184 + 30540862185.

It is an arithmetic number, because the mean of its divisors is an integer number (30540862185).

Almost surely, 2^61081724369 is an apocalyptic number.

It is an amenable number.

61081724369 is a deficient number, since it is larger than the sum of its proper divisors (1).

61081724369 is an equidigital number, since it uses as much as digits as its factorization.

61081724369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 61081724369 in words is "sixty-one billion, eighty-one million, seven hundred twenty-four thousand, three hundred sixty-nine".