53500661 has 2 divisors, whose sum is σ = 53500662. Its totient is φ = 53500660.

The previous prime is 53500633. The next prime is 53500663. The reversal of 53500661 is 16600535.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36120100 + 17380561 = 6010^2 + 4169^2 .

It is a cyclic number.

It is not a de Polignac number, because 53500661 - 2¹⁸ = 53238517 is a prime.

Together with 53500663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53500661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53500663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26750330 + 26750331.

It is an arithmetic number, because the mean of its divisors is an integer number (26750331).

Almost surely, 2^53500661 is an apocalyptic number.

It is an amenable number.

53500661 is a deficient number, since it is larger than the sum of its proper divisors (1).

53500661 is an equidigital number, since it uses as much as digits as its factorization.

53500661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 53500661 is about 7314.4146040541. The cubic root of 53500661 is about 376.8076539940.

The spelling of 53500661 in words is "fifty-three million, five hundred thousand, six hundred sixty-one".