1266381044 has 6 divisors (see below), whose sum is σ = 2216166834. Its totient is φ = 633190520.

The previous prime is 1266381043. The next prime is 1266381047. The reversal of 1266381044 is 4401836621.

It can be written as a sum of positive squares in only one way, i.e., 1048464400 + 217916644 = 32380^2 + 14762^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1266380995 and 1266381013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266381041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158297627 + ... + 158297634.

It is an arithmetic number, because the mean of its divisors is an integer number (369361139).

Almost surely, 2^1266381044 is an apocalyptic number.

It is an amenable number.

1266381044 is a deficient number, since it is larger than the sum of its proper divisors (949785790).

1266381044 is a wasteful number, since it uses less digits than its factorization.

1266381044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316595265 (or 316595263 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1266381044 is about 35586.2479618181. The cubic root of 1266381044 is about 1081.9025233270.

The spelling of 1266381044 in words is "one billion, two hundred sixty-six million, three hundred eighty-one thousand, forty-four".