638615343434 has 4 divisors (see below), whose sum is σ = 957923015154. Its totient is φ = 319307671716.

The previous prime is 638615343409. The next prime is 638615343437. The reversal of 638615343434 is 434343516836.

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

It can be written as a sum of positive squares in only one way, i.e., 372828696409 + 265786647025 = 610597^2 + 515545^2 .

It is not an unprimeable number, because it can be changed into a prime (638615343437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159653835857 + ... + 159653835860.

Almost surely, 2^638615343434 is an apocalyptic number.

638615343434 is a deficient number, since it is larger than the sum of its proper divisors (319307671720).

638615343434 is a wasteful number, since it uses less digits than its factorization.

638615343434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319307671719.

The product of its digits is 7464960, while the sum is 50.

The spelling of 638615343434 in words is "six hundred thirty-eight billion, six hundred fifteen million, three hundred forty-three thousand, four hundred thirty-four".