61081724371 has 2 divisors, whose sum is σ = 61081724372. Its totient is φ = 61081724370.

The previous prime is 61081724369. The next prime is 61081724399. The reversal of 61081724371 is 17342718016.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61081724371 - 2¹ = 61081724369 is a prime.

Together with 61081724369, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61081724971) 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, 30540862185 + 30540862186.

It is an arithmetic number, because the mean of its divisors is an integer number (30540862186).

Almost surely, 2^61081724371 is an apocalyptic number.

61081724371 is a deficient number, since it is larger than the sum of its proper divisors (1).

61081724371 is an equidigital number, since it uses as much as digits as its factorization.

61081724371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 61081724371 in words is "sixty-one billion, eighty-one million, seven hundred twenty-four thousand, three hundred seventy-one".