505406165655 has 32 divisors (see below), whose sum is σ = 815970686400. Its totient is φ = 267110645760.

The previous prime is 505406165651. The next prime is 505406165657. The reversal of 505406165655 is 556561604505.

It is not a de Polignac number, because 505406165655 - 2² = 505406165651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505406165651) 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, 9208695 + ... + 9263415.

It is an arithmetic number, because the mean of its divisors is an integer number (25499083950).

Almost surely, 2^505406165655 is an apocalyptic number.

505406165655 is a deficient number, since it is larger than the sum of its proper divisors (310564520745).

505406165655 is a wasteful number, since it uses less digits than its factorization.

505406165655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60291.

The product of its (nonzero) digits is 2700000, while the sum is 48.

It can be divided in two parts, 505406 and 165655, that added together give a triangular number (671061 = T₁₁₅₈).

The spelling of 505406165655 in words is "five hundred five billion, four hundred six million, one hundred sixty-five thousand, six hundred fifty-five".