61715621668471 has 2 divisors, whose sum is σ = 61715621668472. Its totient is φ = 61715621668470.

The previous prime is 61715621668453. The next prime is 61715621668501. The reversal of 61715621668471 is 17486612651716.

61715621668471 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61715621668471 - 2⁵ = 61715621668439 is a prime.

It is a super-3 number, since 3×61715621668471³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61715621665471) 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, 30857810834235 + 30857810834236.

It is an arithmetic number, because the mean of its divisors is an integer number (30857810834236).

Almost surely, 2^{61715621668471} is an apocalyptic number.

61715621668471 is a deficient number, since it is larger than the sum of its proper divisors (1).

61715621668471 is an equidigital number, since it uses as much as digits as its factorization.

61715621668471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 61.

The spelling of 61715621668471 in words is "sixty-one trillion, seven hundred fifteen billion, six hundred twenty-one million, six hundred sixty-eight thousand, four hundred seventy-one".