6635780505 has 48 divisors (see below), whose sum is σ = 11843015184. Its totient is φ = 3435048960.

The previous prime is 6635780491. The next prime is 6635780521. The reversal of 6635780505 is 5050875366.

6635780505 is a `hidden beast` number, since 6 + 63 + 5 + 7 + 80 + 505 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 115541001 + 6520239504 = 10749^2 + 80748^2 .

It is not a de Polignac number, because 6635780505 - 2⁶ = 6635780441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 354337 + ... + 372593.

It is an arithmetic number, because the mean of its divisors is an integer number (246729483).

Almost surely, 2^6635780505 is an apocalyptic number.

It is an amenable number.

6635780505 is a deficient number, since it is larger than the sum of its proper divisors (5207234679).

6635780505 is a wasteful number, since it uses less digits than its factorization.

6635780505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18506 (or 18503 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The square root of 6635780505 is about 81460.3001774484. The cubic root of 6635780505 is about 1879.1610585512.

The spelling of 6635780505 in words is "six billion, six hundred thirty-five million, seven hundred eighty thousand, five hundred five".