8158138607525 has 24 divisors (see below), whose sum is σ = 10732199914440. Its totient is φ = 6130530344960.

The previous prime is 8158138607473. The next prime is 8158138607527. The reversal of 8158138607525 is 5257068318518.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 12354544801 + 8145784062724 = 111151^2 + 2854082^2 .

It is not a de Polignac number, because 8158138607525 - 2¹² = 8158138603429 is a prime.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8158138607527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18639884 + ... + 19072533.

It is an arithmetic number, because the mean of its divisors is an integer number (447174996435).

Almost surely, 2^{8158138607525} is an apocalyptic number.

8158138607525 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8158138607525 is a deficient number, since it is larger than the sum of its proper divisors (2574061306915).

8158138607525 is a wasteful number, since it uses less digits than its factorization.

8158138607525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37712953 (or 37712948 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 59.

The spelling of 8158138607525 in words is "eight trillion, one hundred fifty-eight billion, one hundred thirty-eight million, six hundred seven thousand, five hundred twenty-five".