638342468237582 has 4 divisors (see below), whose sum is σ = 957513702356376. Its totient is φ = 319171234118790.

The previous prime is 638342468237569. The next prime is 638342468237603. The reversal of 638342468237582 is 285732864243836.

It is a happy number.

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

It is a super-2 number, since 2×638342468237582² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159585617059394 + ... + 159585617059397.

It is an arithmetic number, because the mean of its divisors is an integer number (239378425589094).

Almost surely, 2^{638342468237582} is an apocalyptic number.

638342468237582 is a deficient number, since it is larger than the sum of its proper divisors (319171234118794).

638342468237582 is a wasteful number, since it uses less digits than its factorization.

638342468237582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319171234118793.

The product of its digits is 2229534720, while the sum is 71.

The spelling of 638342468237582 in words is "six hundred thirty-eight trillion, three hundred forty-two billion, four hundred sixty-eight million, two hundred thirty-seven thousand, five hundred eighty-two".