138061565 has 16 divisors (see below), whose sum is σ = 168428160. Its totient is φ = 108628800.

The previous prime is 138061537. The next prime is 138061579. The reversal of 138061565 is 565160831.

It is not a de Polignac number, because 138061565 - 2⁶ = 138061501 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79931 + ... + 81639.

It is an arithmetic number, because the mean of its divisors is an integer number (10526760).

Almost surely, 2^138061565 is an apocalyptic number.

It is an amenable number.

138061565 is a deficient number, since it is larger than the sum of its proper divisors (30366595).

138061565 is a wasteful number, since it uses less digits than its factorization.

138061565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 138061565 is about 11749.9602126986. The cubic root of 138061565 is about 516.8417607502.

The spelling of 138061565 in words is "one hundred thirty-eight million, sixty-one thousand, five hundred sixty-five".