6406155205 has 4 divisors (see below), whose sum is σ = 7687386252. Its totient is φ = 5124924160.

The previous prime is 6406155193. The next prime is 6406155251. The reversal of 6406155205 is 5025516046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 931043169 + 5475112036 = 30513^2 + 73994^2 .

It is not a de Polignac number, because 6406155205 - 2²³ = 6397766597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640615516 + ... + 640615525.

It is an arithmetic number, because the mean of its divisors is an integer number (1921846563).

Almost surely, 2^6406155205 is an apocalyptic number.

It is an amenable number.

6406155205 is a deficient number, since it is larger than the sum of its proper divisors (1281231047).

6406155205 is a wasteful number, since it uses less digits than its factorization.

6406155205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281231046.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 6406155205 is about 80038.4607860496. The cubic root of 6406155205 is about 1857.2305496250.

The spelling of 6406155205 in words is "six billion, four hundred six million, one hundred fifty-five thousand, two hundred five".