13640121642506 has 8 divisors (see below), whose sum is σ = 21663722608740. Its totient is φ = 6418880772928.

The previous prime is 13640121642493. The next prime is 13640121642547. The reversal of 13640121642506 is 60524612104631.

It can be written as a sum of positive squares in 2 ways, for example, as 11949708217225 + 1690413425281 = 3456835^2 + 1300159^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200590024121 + ... + 200590024188.

Almost surely, 2^{13640121642506} is an apocalyptic number.

13640121642506 is a deficient number, since it is larger than the sum of its proper divisors (8023600966234).

13640121642506 is a wasteful number, since it uses less digits than its factorization.

13640121642506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401180048328.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 13640121642506 in words is "thirteen trillion, six hundred forty billion, one hundred twenty-one million, six hundred forty-two thousand, five hundred six".