638863465153 has 8 divisors (see below), whose sum is σ = 640842165000. Its totient is φ = 636887236608.

The previous prime is 638863465129. The next prime is 638863465159. The reversal of 638863465153 is 351564368836.

It can be written as a sum of positive squares in 4 ways, for example, as 138069466929 + 500793998224 = 371577^2 + 707668^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638863465153 - 2¹³ = 638863456961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638863465159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99328 + ... + 1134721.

It is an arithmetic number, because the mean of its divisors is an integer number (80105270625).

Almost surely, 2^638863465153 is an apocalyptic number.

It is an amenable number.

638863465153 is a deficient number, since it is larger than the sum of its proper divisors (1978699847).

638863465153 is a wasteful number, since it uses less digits than its factorization.

638863465153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235651.

The product of its digits is 37324800, while the sum is 58.

The spelling of 638863465153 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, four hundred sixty-five thousand, one hundred fifty-three".