61844091457 has 2 divisors, whose sum is σ = 61844091458. Its totient is φ = 61844091456.

The previous prime is 61844091389. The next prime is 61844091473. The reversal of 61844091457 is 75419044816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61742807361 + 101284096 = 248481^2 + 10064^2 .

It is a cyclic number.

It is not a de Polignac number, because 61844091457 - 2⁷ = 61844091329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61844091457.

It is not a weakly prime, because it can be changed into another prime (61844091497) 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, 30922045728 + 30922045729.

It is an arithmetic number, because the mean of its divisors is an integer number (30922045729).

Almost surely, 2^61844091457 is an apocalyptic number.

It is an amenable number.

61844091457 is a deficient number, since it is larger than the sum of its proper divisors (1).

61844091457 is an equidigital number, since it uses as much as digits as its factorization.

61844091457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 61844091457 in words is "sixty-one billion, eight hundred forty-four million, ninety-one thousand, four hundred fifty-seven".