1266416646 has 16 divisors (see below), whose sum is σ = 2763091008. Its totient is φ = 383762600.

The previous prime is 1266416617. The next prime is 1266416653. The reversal of 1266416646 is 6466146621.

It is a super-2 number, since 2×1266416646² = 3207622242531778632, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1266416598 and 1266416607.

It is a congruent number.

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, 9594000 + ... + 9594131.

It is an arithmetic number, because the mean of its divisors is an integer number (172693188).

Almost surely, 2^1266416646 is an apocalyptic number.

1266416646 is an abundant number, since it is smaller than the sum of its proper divisors (1496674362).

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

1266416646 is a wasteful number, since it uses less digits than its factorization.

1266416646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19188147.

The product of its digits is 248832, while the sum is 42.

The square root of 1266416646 is about 35586.7481796244. The cubic root of 1266416646 is about 1081.9126618059.

The spelling of 1266416646 in words is "one billion, two hundred sixty-six million, four hundred sixteen thousand, six hundred forty-six".