61724621767 has 2 divisors, whose sum is σ = 61724621768. Its totient is φ = 61724621766.

The previous prime is 61724621759. The next prime is 61724621771. The reversal of 61724621767 is 76712642716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61724621767 - 2³ = 61724621759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61724621767.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61724621797) 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, 30862310883 + 30862310884.

It is an arithmetic number, because the mean of its divisors is an integer number (30862310884).

Almost surely, 2^61724621767 is an apocalyptic number.

61724621767 is a deficient number, since it is larger than the sum of its proper divisors (1).

61724621767 is an equidigital number, since it uses as much as digits as its factorization.

61724621767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 49.

The spelling of 61724621767 in words is "sixty-one billion, seven hundred twenty-four million, six hundred twenty-one thousand, seven hundred sixty-seven".