138564267261 has 48 divisors (see below), whose sum is σ = 219826229184. Its totient is φ = 77382230016.

The previous prime is 138564267251. The next prime is 138564267269. The reversal of 138564267261 is 162762465831.

It is not a de Polignac number, because 138564267261 - 2⁹ = 138564266749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138564267269) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1967686 + ... + 2036888.

It is an arithmetic number, because the mean of its divisors is an integer number (4579713108).

Almost surely, 2^138564267261 is an apocalyptic number.

It is an amenable number.

138564267261 is a deficient number, since it is larger than the sum of its proper divisors (81261961923).

138564267261 is a wasteful number, since it uses less digits than its factorization.

138564267261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69530 (or 69523 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

The spelling of 138564267261 in words is "one hundred thirty-eight billion, five hundred sixty-four million, two hundred sixty-seven thousand, two hundred sixty-one".