638417810287811 has 16 divisors (see below), whose sum is σ = 680629015795200. Its totient is φ = 597069964883808.

The previous prime is 638417810287799. The next prime is 638417810287843. The reversal of 638417810287811 is 118782018714836.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638417810287811 is a prime.

It is a super-3 number, since 3×638417810287811³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638417810257811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22552436 + ... + 42254561.

It is an arithmetic number, because the mean of its divisors is an integer number (42539313487200).

Almost surely, 2^{638417810287811} is an apocalyptic number.

638417810287811 is a deficient number, since it is larger than the sum of its proper divisors (42211205507389).

638417810287811 is a wasteful number, since it uses less digits than its factorization.

638417810287811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64813658.

The product of its (nonzero) digits is 28901376, while the sum is 65.

The spelling of 638417810287811 in words is "six hundred thirty-eight trillion, four hundred seventeen billion, eight hundred ten million, two hundred eighty-seven thousand, eight hundred eleven".