126717217765 has 16 divisors (see below), whose sum is σ = 152375054832. Its totient is φ = 101164391424.

The previous prime is 126717217747. The next prime is 126717217787. The reversal of 126717217765 is 567712717621.

It can be written as a sum of positive squares in 8 ways, for example, as 2310051969 + 124407165796 = 48063^2 + 352714^2 .

It is a cyclic number.

It is not a de Polignac number, because 126717217765 - 2²³ = 126708829157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5156287 + ... + 5180803.

It is an arithmetic number, because the mean of its divisors is an integer number (9523440927).

Almost surely, 2^126717217765 is an apocalyptic number.

It is an amenable number.

126717217765 is a deficient number, since it is larger than the sum of its proper divisors (25657837067).

126717217765 is a wasteful number, since it uses less digits than its factorization.

126717217765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26616.

The product of its digits is 1728720, while the sum is 52.

The spelling of 126717217765 in words is "one hundred twenty-six billion, seven hundred seventeen million, two hundred seventeen thousand, seven hundred sixty-five".