55431768505 has 16 divisors (see below), whose sum is σ = 70493791104. Its totient is φ = 41699623680.

The previous prime is 55431768503. The next prime is 55431768521. The reversal of 55431768505 is 50586713455.

It is not a de Polignac number, because 55431768505 - 2¹ = 55431768503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55431768503) 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, 194901 + ... + 385810.

It is an arithmetic number, because the mean of its divisors is an integer number (4405861944).

Almost surely, 2^55431768505 is an apocalyptic number.

It is an amenable number.

55431768505 is a deficient number, since it is larger than the sum of its proper divisors (15062022599).

55431768505 is a wasteful number, since it uses less digits than its factorization.

55431768505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581856.

The product of its (nonzero) digits is 2520000, while the sum is 49.

The spelling of 55431768505 in words is "fifty-five billion, four hundred thirty-one million, seven hundred sixty-eight thousand, five hundred five".