3531255661 has 4 divisors (see below), whose sum is σ = 3531434400. Its totient is φ = 3531076924.

The previous prime is 3531255647. The next prime is 3531255677. The reversal of 3531255661 is 1665521353.

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: 1665521353 = 73 ⋅22815361.

It is a cyclic number.

It is not a de Polignac number, because 3531255661 - 2⁹ = 3531255149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3531255661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3531255641) 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, 55441 + ... + 100678.

It is an arithmetic number, because the mean of its divisors is an integer number (882858600).

Almost surely, 2^3531255661 is an apocalyptic number.

It is an amenable number.

3531255661 is a deficient number, since it is larger than the sum of its proper divisors (178739).

3531255661 is a wasteful number, since it uses less digits than its factorization.

3531255661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178738.

The product of its digits is 81000, while the sum is 37.

The square root of 3531255661 is about 59424.3692520165. The cubic root of 3531255661 is about 1522.8006509706.

The spelling of 3531255661 in words is "three billion, five hundred thirty-one million, two hundred fifty-five thousand, six hundred sixty-one".