61873566109 has 2 divisors, whose sum is σ = 61873566110. Its totient is φ = 61873566108.

The previous prime is 61873566077. The next prime is 61873566113. The reversal of 61873566109 is 90166537816.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57000130009 + 4873436100 = 238747^2 + 69810^2 .

It is a cyclic number.

It is not a de Polignac number, because 61873566109 - 2⁵ = 61873566077 is a prime.

It is a super-4 number, since 4×61873566109⁴ (a number of 44 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61873566119) 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, 30936783054 + 30936783055.

It is an arithmetic number, because the mean of its divisors is an integer number (30936783055).

Almost surely, 2^61873566109 is an apocalyptic number.

It is an amenable number.

61873566109 is a deficient number, since it is larger than the sum of its proper divisors (1).

61873566109 is an equidigital number, since it uses as much as digits as its factorization.

61873566109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 61873566109 in words is "sixty-one billion, eight hundred seventy-three million, five hundred sixty-six thousand, one hundred nine".