6406376945 has 4 divisors (see below), whose sum is σ = 7687652340. Its totient is φ = 5125101552.

The previous prime is 6406376939. The next prime is 6406377007. The reversal of 6406376945 is 5496736046.

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 2278057441 + 4128319504 = 47729^2 + 64252^2 .

It is a cyclic number.

It is not a de Polignac number, because 6406376945 - 2¹² = 6406372849 is a prime.

It is a super-2 number, since 2×6406376945² = 82083331122855066050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6406376893 and 6406376902.

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, 640637690 + ... + 640637699.

It is an arithmetic number, because the mean of its divisors is an integer number (1921913085).

Almost surely, 2^6406376945 is an apocalyptic number.

It is an amenable number.

6406376945 is a deficient number, since it is larger than the sum of its proper divisors (1281275395).

6406376945 is a wasteful number, since it uses less digits than its factorization.

6406376945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281275394.

The product of its (nonzero) digits is 3265920, while the sum is 50.

The square root of 6406376945 is about 80039.8459831102. The cubic root of 6406376945 is about 1857.2519778472.

The spelling of 6406376945 in words is "six billion, four hundred six million, three hundred seventy-six thousand, nine hundred forty-five".