138777765025 has 12 divisors (see below), whose sum is σ = 172183324924. Its totient is φ = 110958408000.

The previous prime is 138777765023. The next prime is 138777765053. The reversal of 138777765025 is 520567777831.

It can be written as a sum of positive squares in 6 ways, for example, as 45333223056 + 93444541969 = 212916^2 + 305687^2 .

It is not a de Polignac number, because 138777765025 - 2¹ = 138777765023 is a prime.

It is a super-2 number, since 2×138777765025² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138777765023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1550706 + ... + 1637755.

Almost surely, 2^138777765025 is an apocalyptic number.

It is an amenable number.

138777765025 is a deficient number, since it is larger than the sum of its proper divisors (33405559899).

138777765025 is a wasteful number, since it uses less digits than its factorization.

138777765025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3190212 (or 3190207 counting only the distinct ones).

The product of its (nonzero) digits is 17287200, while the sum is 58.

The spelling of 138777765025 in words is "one hundred thirty-eight billion, seven hundred seventy-seven million, seven hundred sixty-five thousand, twenty-five".