8165751821537 has 4 divisors (see below), whose sum is σ = 8182382681136. Its totient is φ = 8149120961940.

The previous prime is 8165751821501. The next prime is 8165751821567. The reversal of 8165751821537 is 7351281575618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8165751821537 - 2¹² = 8165751817441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8165751821567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8315429063 + ... + 8315430044.

It is an arithmetic number, because the mean of its divisors is an integer number (2045595670284).

Almost surely, 2^{8165751821537} is an apocalyptic number.

It is an amenable number.

8165751821537 is a deficient number, since it is larger than the sum of its proper divisors (16630859599).

8165751821537 is a wasteful number, since it uses less digits than its factorization.

8165751821537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16630859598.

The product of its digits is 14112000, while the sum is 59.

The spelling of 8165751821537 in words is "eight trillion, one hundred sixty-five billion, seven hundred fifty-one million, eight hundred twenty-one thousand, five hundred thirty-seven".