1266955983937 has 16 divisors (see below), whose sum is σ = 1448913070080. Its totient is φ = 1085240017872.

The previous prime is 1266955983913. The next prime is 1266955983947. The reversal of 1266955983937 is 7393895596621.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266955983937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1266955983937.

It is not an unprimeable number, because it can be changed into a prime (1266955983947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77419918 + ... + 77436280.

It is an arithmetic number, because the mean of its divisors is an integer number (90557066880).

Almost surely, 2^{1266955983937} is an apocalyptic number.

It is an amenable number.

1266955983937 is a deficient number, since it is larger than the sum of its proper divisors (181957086143).

1266955983937 is a wasteful number, since it uses less digits than its factorization.

1266955983937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23052.

The product of its digits is 661348800, while the sum is 73.

The spelling of 1266955983937 in words is "one trillion, two hundred sixty-six billion, nine hundred fifty-five million, nine hundred eighty-three thousand, nine hundred thirty-seven".