138170603521 has 8 divisors (see below), whose sum is σ = 140505653888. Its totient is φ = 135837810000.

The previous prime is 138170603509. The next prime is 138170603531. The reversal of 138170603521 is 125306071831.

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

It is a cyclic number.

It is not a de Polignac number, because 138170603521 - 2¹⁷ = 138170472449 is a prime.

It is a super-2 number, since 2×138170603521² (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 (138170603531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440505 + ... + 685846.

It is an arithmetic number, because the mean of its divisors is an integer number (17563206736).

Almost surely, 2^138170603521 is an apocalyptic number.

It is an amenable number.

138170603521 is a deficient number, since it is larger than the sum of its proper divisors (2335050367).

138170603521 is a wasteful number, since it uses less digits than its factorization.

138170603521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128423.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 138170603521 in words is "one hundred thirty-eight billion, one hundred seventy million, six hundred three thousand, five hundred twenty-one".