61745807911 has 2 divisors, whose sum is σ = 61745807912. Its totient is φ = 61745807910.

The previous prime is 61745807891. The next prime is 61745807917. The reversal of 61745807911 is 11970854716.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61745807911 is a prime.

It is a super-2 number, since 2×61745807911² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61745807917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30872903955 + 30872903956.

It is an arithmetic number, because the mean of its divisors is an integer number (30872903956).

Almost surely, 2^61745807911 is an apocalyptic number.

61745807911 is a deficient number, since it is larger than the sum of its proper divisors (1).

61745807911 is an equidigital number, since it uses as much as digits as its factorization.

61745807911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 61745807911 in words is "sixty-one billion, seven hundred forty-five million, eight hundred seven thousand, nine hundred eleven".