266401655 has 16 divisors (see below), whose sum is σ = 344626464. Its totient is φ = 196525440.

The previous prime is 266401651. The next prime is 266401669. The reversal of 266401655 is 556104662.

It is not a de Polignac number, because 266401655 - 2² = 266401651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266401651) 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, 98177 + ... + 100853.

It is an arithmetic number, because the mean of its divisors is an integer number (21539154).

Almost surely, 2^266401655 is an apocalyptic number.

266401655 is a deficient number, since it is larger than the sum of its proper divisors (78224809).

266401655 is a wasteful number, since it uses less digits than its factorization.

266401655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4226.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 266401655 is about 16321.8153095788. The cubic root of 266401655 is about 643.4462974395.

The spelling of 266401655 in words is "two hundred sixty-six million, four hundred one thousand, six hundred fifty-five".