53415661 has 16 divisors (see below), whose sum is σ = 59376240. Its totient is φ = 48023040.

The previous prime is 53415647. The next prime is 53415689. The reversal of 53415661 is 16651435.

It can be written as a sum of positive squares in 8 ways, for example, as 46498761 + 6916900 = 6819^2 + 2630^2 .

It is not a de Polignac number, because 53415661 - 2⁷ = 53415533 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 (53415601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89781 + ... + 90373.

It is an arithmetic number, because the mean of its divisors is an integer number (3711015).

Almost surely, 2^53415661 is an apocalyptic number.

It is an amenable number.

53415661 is a deficient number, since it is larger than the sum of its proper divisors (5960579).

53415661 is an equidigital number, since it uses as much as digits as its factorization.

53415661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 647 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 53415661 is about 7308.6018498753. The cubic root of 53415661 is about 376.6079952297.

The spelling of 53415661 in words is "fifty-three million, four hundred fifteen thousand, six hundred sixty-one".