138848417552461 has 4 divisors (see below), whose sum is σ = 140750450669692. Its totient is φ = 136946384435232.

The previous prime is 138848417552447. The next prime is 138848417552521. The reversal of 138848417552461 is 164255714848831.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64963906280361 + 73884511272100 = 8060019^2 + 8595610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138848417552461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138848417552861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951016558506 + ... + 951016558651.

It is an arithmetic number, because the mean of its divisors is an integer number (35187612667423).

Almost surely, 2^{138848417552461} is an apocalyptic number.

It is an amenable number.

138848417552461 is a deficient number, since it is larger than the sum of its proper divisors (1902033117231).

138848417552461 is an equidigital number, since it uses as much as digits as its factorization.

138848417552461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902033117230.

The product of its digits is 206438400, while the sum is 67.

The spelling of 138848417552461 in words is "one hundred thirty-eight trillion, eight hundred forty-eight billion, four hundred seventeen million, five hundred fifty-two thousand, four hundred sixty-one".