1266615946 has 16 divisors (see below), whose sum is σ = 1910717640. Its totient is φ = 629717760.

The previous prime is 1266615907. The next prime is 1266615947. The reversal of 1266615946 is 6495166621.

It can be written as a sum of positive squares in 4 ways, for example, as 835845921 + 430770025 = 28911^2 + 20755^2 .

It is a super-2 number, since 2×1266615946² = 3208631909322949832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1266615896 and 1266615905.

It is not an unprimeable number, because it can be changed into a prime (1266615947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501166 + ... + 503686.

Almost surely, 2^1266615946 is an apocalyptic number.

1266615946 is a deficient number, since it is larger than the sum of its proper divisors (644101694).

1266615946 is a wasteful number, since it uses less digits than its factorization.

1266615946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849.

The product of its digits is 466560, while the sum is 46.

The square root of 1266615946 is about 35589.5482691197. The cubic root of 1266615946 is about 1081.9694135035.

The spelling of 1266615946 in words is "one billion, two hundred sixty-six million, six hundred fifteen thousand, nine hundred forty-six".