1266005225551 has 8 divisors (see below), whose sum is σ = 1381820857344. Its totient is φ = 1150310301720.

The previous prime is 1266005225477. The next prime is 1266005225579. The reversal of 1266005225551 is 1555225006621.

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 1266005225551 - 2⁹ = 1266005225039 is a prime.

It is a super-2 number, since 2×1266005225551² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266005225351) 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, 30155055 + ... + 30197008.

It is an arithmetic number, because the mean of its divisors is an integer number (172727607168).

Almost surely, 2^{1266005225551} is an apocalyptic number.

1266005225551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1266005225551 is a deficient number, since it is larger than the sum of its proper divisors (115815631793).

1266005225551 is a wasteful number, since it uses less digits than its factorization.

1266005225551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60353981.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 1266005225551 in words is "one trillion, two hundred sixty-six billion, five million, two hundred twenty-five thousand, five hundred fifty-one".