3611656421 has 4 divisors (see below), whose sum is σ = 3699745644. Its totient is φ = 3523567200.

The previous prime is 3611656403. The next prime is 3611656423. The reversal of 3611656421 is 1246561163.

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 589955521 + 3021700900 = 24289^2 + 54970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3611656421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3611656423) 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, 44044550 + ... + 44044631.

It is an arithmetic number, because the mean of its divisors is an integer number (924936411).

Almost surely, 2^3611656421 is an apocalyptic number.

It is an amenable number.

3611656421 is a deficient number, since it is larger than the sum of its proper divisors (88089223).

3611656421 is an equidigital number, since it uses as much as digits as its factorization.

3611656421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88089222.

The product of its digits is 25920, while the sum is 35.

The square root of 3611656421 is about 60097.0583389903. The cubic root of 3611656421 is about 1534.2712355119.

The spelling of 3611656421 in words is "three billion, six hundred eleven million, six hundred fifty-six thousand, four hundred twenty-one".