1266655250001 has 16 divisors (see below), whose sum is σ = 1793091734784. Its totient is φ = 792598497024.

The previous prime is 1266655249999. The next prime is 1266655250057. The reversal of 1266655250001 is 1000525566621.

It is a happy number.

It is not a de Polignac number, because 1266655250001 - 2¹ = 1266655249999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1266655250501) 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, 33818310 + ... + 33855743.

It is an arithmetic number, because the mean of its divisors is an integer number (112068233424).

Almost surely, 2^{1266655250001} is an apocalyptic number.

It is an amenable number.

1266655250001 is a deficient number, since it is larger than the sum of its proper divisors (526436484783).

1266655250001 is a wasteful number, since it uses less digits than its factorization.

1266655250001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67674440.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 1266655250001 in words is "one trillion, two hundred sixty-six billion, six hundred fifty-five million, two hundred fifty thousand, one".