61775422889 has 2 divisors, whose sum is σ = 61775422890. Its totient is φ = 61775422888.

The previous prime is 61775422811. The next prime is 61775422927. The reversal of 61775422889 is 98822457716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51913344025 + 9862078864 = 227845^2 + 99308^2 .

It is a cyclic number.

It is not a de Polignac number, because 61775422889 - 2²⁸ = 61506987433 is a prime.

It is a super-2 number, since 2×61775422889² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61775425889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30887711444 + 30887711445.

It is an arithmetic number, because the mean of its divisors is an integer number (30887711445).

Almost surely, 2^61775422889 is an apocalyptic number.

It is an amenable number.

61775422889 is a deficient number, since it is larger than the sum of its proper divisors (1).

61775422889 is an equidigital number, since it uses as much as digits as its factorization.

61775422889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 59.

The spelling of 61775422889 in words is "sixty-one billion, seven hundred seventy-five million, four hundred twenty-two thousand, eight hundred eighty-nine".