61881995313122 has 16 divisors (see below), whose sum is σ = 92997320997240. Its totient is φ = 30882901408128.

The previous prime is 61881995313049. The next prime is 61881995313143. The reversal of 61881995313122 is 22131359918816.

It is a Cunningham number, because it is equal to 7866511²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 60815214124921 + 1066781188201 = 7798411^2 + 1032851^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6195668 + ... + 12733824.

Almost surely, 2^{61881995313122} is an apocalyptic number.

61881995313122 is a deficient number, since it is larger than the sum of its proper divisors (31115325684118).

61881995313122 is a wasteful number, since it uses less digits than its factorization.

61881995313122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547045.

The product of its digits is 5598720, while the sum is 59.

The spelling of 61881995313122 in words is "sixty-one trillion, eight hundred eighty-one billion, nine hundred ninety-five million, three hundred thirteen thousand, one hundred twenty-two".