53401663 has 4 divisors (see below), whose sum is σ = 61030480. Its totient is φ = 45772848.

The previous prime is 53401637. The next prime is 53401669. The reversal of 53401663 is 36610435.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53401663 - 2²¹ = 51304511 is a prime.

It is a super-2 number, since 2×53401663² = 5703475222331138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53401669) 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, 3814398 + ... + 3814411.

It is an arithmetic number, because the mean of its divisors is an integer number (15257620).

Almost surely, 2^53401663 is an apocalyptic number.

53401663 is a deficient number, since it is larger than the sum of its proper divisors (7628817).

53401663 is an equidigital number, since it uses as much as digits as its factorization.

53401663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7628816.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 53401663 is about 7307.6441484243. The cubic root of 53401663 is about 376.5750946460.

The spelling of 53401663 in words is "fifty-three million, four hundred one thousand, six hundred sixty-three".