1266787516 has 6 divisors (see below), whose sum is σ = 2216878160. Its totient is φ = 633393756.

The previous prime is 1266787507. The next prime is 1266787519. The reversal of 1266787516 is 6157876621.

It is a happy number.

It is a super-2 number, since 2×1266787516² = 3209501221386900512, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1266787516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266787519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158348436 + ... + 158348443.

Almost surely, 2^1266787516 is an apocalyptic number.

It is an amenable number.

1266787516 is a deficient number, since it is larger than the sum of its proper divisors (950090644).

1266787516 is a wasteful number, since it uses less digits than its factorization.

1266787516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316696883 (or 316696881 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The square root of 1266787516 is about 35591.9585861751. The cubic root of 1266787516 is about 1082.0182641731.

The spelling of 1266787516 in words is "one billion, two hundred sixty-six million, seven hundred eighty-seven thousand, five hundred sixteen".