1266719731161 has 16 divisors (see below), whose sum is σ = 1689987636480. Its totient is φ = 843965982720.

The previous prime is 1266719731129. The next prime is 1266719731177. The reversal of 1266719731161 is 1611379176621.

It is not a de Polignac number, because 1266719731161 - 2⁵ = 1266719731129 is a prime.

It is a super-2 number, since 2×1266719731161² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1266719731181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39197536 + ... + 39229838.

It is an arithmetic number, because the mean of its divisors is an integer number (105624227280).

Almost surely, 2^{1266719731161} is an apocalyptic number.

It is an amenable number.

1266719731161 is a deficient number, since it is larger than the sum of its proper divisors (423267905319).

1266719731161 is a wasteful number, since it uses less digits than its factorization.

1266719731161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39856.

The product of its digits is 571536, while the sum is 51.

The spelling of 1266719731161 in words is "one trillion, two hundred sixty-six billion, seven hundred nineteen million, seven hundred thirty-one thousand, one hundred sixty-one".