3506661857 has 4 divisors (see below), whose sum is σ = 3659125440. Its totient is φ = 3354198276.

The previous prime is 3506661839. The next prime is 3506661863. The reversal of 3506661857 is 7581666053.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7581666053 = 13 ⋅583205081.

It is a cyclic number.

It is not a de Polignac number, because 3506661857 - 2²⁰ = 3505613281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3506664857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76231757 + ... + 76231802.

It is an arithmetic number, because the mean of its divisors is an integer number (914781360).

Almost surely, 2^3506661857 is an apocalyptic number.

It is an amenable number.

3506661857 is a deficient number, since it is larger than the sum of its proper divisors (152463583).

3506661857 is a wasteful number, since it uses less digits than its factorization.

3506661857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152463582.

The product of its (nonzero) digits is 907200, while the sum is 47.

The square root of 3506661857 is about 59217.0740327484. The cubic root of 3506661857 is about 1519.2571764286.

The spelling of 3506661857 in words is "three billion, five hundred six million, six hundred sixty-one thousand, eight hundred fifty-seven".