3497978665 has 8 divisors (see below), whose sum is σ = 4204126728. Its totient is φ = 2794014720.

The previous prime is 3497978647. The next prime is 3497978681. The reversal of 3497978665 is 5668797943.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 775956736 + 2722021929 = 27856^2 + 52173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3497978665 - 2⁹ = 3497978153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3497978597 and 3497978606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542502 + ... + 548911.

It is an arithmetic number, because the mean of its divisors is an integer number (525515841).

Almost surely, 2^3497978665 is an apocalyptic number.

It is an amenable number.

3497978665 is a deficient number, since it is larger than the sum of its proper divisors (706148063).

3497978665 is a wasteful number, since it uses less digits than its factorization.

3497978665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092059.

The product of its digits is 68584320, while the sum is 64.

The square root of 3497978665 is about 59143.7119650094. The cubic root of 3497978665 is about 1518.0021456732.

The spelling of 3497978665 in words is "three billion, four hundred ninety-seven million, nine hundred seventy-eight thousand, six hundred sixty-five".