1266165138 has 16 divisors (see below), whose sum is σ = 2894091840. Its totient is φ = 361761456.

The previous prime is 1266165107. The next prime is 1266165163. The reversal of 1266165138 is 8315616621.

It is a junction number, because it is equal to n+sod(n) for n = 1266165096 and 1266165105.

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, 15073353 + ... + 15073436.

It is an arithmetic number, because the mean of its divisors is an integer number (180880740).

Almost surely, 2^1266165138 is an apocalyptic number.

1266165138 is an abundant number, since it is smaller than the sum of its proper divisors (1627926702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266165138 is a wasteful number, since it uses less digits than its factorization.

1266165138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30146801.

The product of its digits is 51840, while the sum is 39.

The square root of 1266165138 is about 35583.2142730249. The cubic root of 1266165138 is about 1081.8410351139.

The spelling of 1266165138 in words is "one billion, two hundred sixty-six million, one hundred sixty-five thousand, one hundred thirty-eight".