638820011435 has 16 divisors (see below), whose sum is σ = 807033542400. Its totient is φ = 484096523616.

The previous prime is 638820011419. The next prime is 638820011441. The reversal of 638820011435 is 534110028836.

It is a cyclic number.

It is not a de Polignac number, because 638820011435 - 2⁴ = 638820011419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638820011392 and 638820011401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325946 + ... + 1176384.

It is an arithmetic number, because the mean of its divisors is an integer number (50439596400).

Almost surely, 2^638820011435 is an apocalyptic number.

638820011435 is a deficient number, since it is larger than the sum of its proper divisors (168213530965).

638820011435 is a wasteful number, since it uses less digits than its factorization.

638820011435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858370.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 638820011435 in words is "six hundred thirty-eight billion, eight hundred twenty million, eleven thousand, four hundred thirty-five".