61640716255501 has 2 divisors, whose sum is σ = 61640716255502. Its totient is φ = 61640716255500.

The previous prime is 61640716255361. The next prime is 61640716255519. The reversal of 61640716255501 is 10555261704616.

61640716255501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61438962566601 + 201753688900 = 7838301^2 + 449170^2 .

It is a cyclic number.

It is not a de Polignac number, because 61640716255501 - 2³¹ = 61638568771853 is a prime.

It is a super-2 number, since 2×61640716255501² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61640716255541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30820358127750 + 30820358127751.

It is an arithmetic number, because the mean of its divisors is an integer number (30820358127751).

Almost surely, 2^{61640716255501} is an apocalyptic number.

It is an amenable number.

61640716255501 is a deficient number, since it is larger than the sum of its proper divisors (1).

61640716255501 is an equidigital number, since it uses as much as digits as its factorization.

61640716255501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512000, while the sum is 49.

The spelling of 61640716255501 in words is "sixty-one trillion, six hundred forty billion, seven hundred sixteen million, two hundred fifty-five thousand, five hundred one".