1266551655375 has 32 divisors (see below), whose sum is σ = 2107777434048. Its totient is φ = 675418742400.

The previous prime is 1266551655373. The next prime is 1266551655389. The reversal of 1266551655375 is 5735561556621.

It is not a de Polignac number, because 1266551655375 - 2¹ = 1266551655373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266551655373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3255777 + ... + 3623973.

It is an arithmetic number, because the mean of its divisors is an integer number (65868044814).

Almost surely, 2^{1266551655375} is an apocalyptic number.

1266551655375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1266551655375 is a deficient number, since it is larger than the sum of its proper divisors (841225778673).

1266551655375 is an equidigital number, since it uses as much as digits as its factorization.

1266551655375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377388 (or 377378 counting only the distinct ones).

The product of its digits is 28350000, while the sum is 57.

The spelling of 1266551655375 in words is "one trillion, two hundred sixty-six billion, five hundred fifty-one million, six hundred fifty-five thousand, three hundred seventy-five".