1266596987 has 8 divisors (see below), whose sum is σ = 1304771952. Its totient is φ = 1228629600.

The previous prime is 1266596983. The next prime is 1266596993. The reversal of 1266596987 is 7896956621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1266596987 - 2² = 1266596983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266596983) 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, 39464 + ... + 63957.

It is an arithmetic number, because the mean of its divisors is an integer number (163096494).

Almost surely, 2^1266596987 is an apocalyptic number.

1266596987 is a deficient number, since it is larger than the sum of its proper divisors (38174965).

1266596987 is a wasteful number, since it uses less digits than its factorization.

1266596987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103789.

The product of its digits is 9797760, while the sum is 59.

The square root of 1266596987 is about 35589.2819118341. The cubic root of 1266596987 is about 1081.9640150872.

The spelling of 1266596987 in words is "one billion, two hundred sixty-six million, five hundred ninety-six thousand, nine hundred eighty-seven".