1638369053 has 4 divisors (see below), whose sum is σ = 1666138080. Its totient is φ = 1610600028.

The previous prime is 1638369043. The next prime is 1638369059. The reversal of 1638369053 is 3509638361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3509638361 = 7039 ⋅498599.

It is a cyclic number.

It is not a de Polignac number, because 1638369053 - 2⁴ = 1638369037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1638368995 and 1638369013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638369059) 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, 13884425 + ... + 13884542.

It is an arithmetic number, because the mean of its divisors is an integer number (416534520).

Almost surely, 2^1638369053 is an apocalyptic number.

It is an amenable number.

1638369053 is a deficient number, since it is larger than the sum of its proper divisors (27769027).

1638369053 is an equidigital number, since it uses as much as digits as its factorization.

1638369053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27769026.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 1638369053 is about 40476.7717709800. The cubic root of 1638369053 is about 1178.8826570102.

The spelling of 1638369053 in words is "one billion, six hundred thirty-eight million, three hundred sixty-nine thousand, fifty-three".