117877771261 has 2 divisors, whose sum is σ = 117877771262. Its totient is φ = 117877771260.

The previous prime is 117877771217. The next prime is 117877771267. The reversal of 117877771261 is 162177778711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88467579225 + 29410192036 = 297435^2 + 171494^2 .

It is a cyclic number.

It is not a de Polignac number, because 117877771261 - 2²⁷ = 117743553533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117877771267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58938885630 + 58938885631.

It is an arithmetic number, because the mean of its divisors is an integer number (58938885631).

Almost surely, 2^117877771261 is an apocalyptic number.

It is an amenable number.

117877771261 is a deficient number, since it is larger than the sum of its proper divisors (1).

117877771261 is an equidigital number, since it uses as much as digits as its factorization.

117877771261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1613472, while the sum is 55.

The spelling of 117877771261 in words is "one hundred seventeen billion, eight hundred seventy-seven million, seven hundred seventy-one thousand, two hundred sixty-one".