3502661561 has 12 divisors (see below), whose sum is σ = 4116535668. Its totient is φ = 2971325952.

The previous prime is 3502661551. The next prime is 3502661567. The reversal of 3502661561 is 1651662053.

It can be written as a sum of positive squares in 2 ways, for example, as 968143225 + 2534518336 = 31115^2 + 50344^2 .

It is not a de Polignac number, because 3502661561 - 2⁶ = 3502661497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3502661567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 363716 + ... + 373221.

It is an arithmetic number, because the mean of its divisors is an integer number (343044639).

Almost surely, 2^3502661561 is an apocalyptic number.

It is an amenable number.

3502661561 is a deficient number, since it is larger than the sum of its proper divisors (613874107).

3502661561 is an equidigital number, since it uses as much as digits as its factorization.

3502661561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737048 (or 737041 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 3502661561 is about 59183.2878522307. The cubic root of 3502661561 is about 1518.6792487467.

The spelling of 3502661561 in words is "three billion, five hundred two million, six hundred sixty-one thousand, five hundred sixty-one".