8165541557 has 4 divisors (see below), whose sum is σ = 8299402956. Its totient is φ = 8031680160.

The previous prime is 8165541551. The next prime is 8165541589. The reversal of 8165541557 is 7551455618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1774178641 + 6391362916 = 42121^2 + 79946^2 .

It is a cyclic number.

It is not a de Polignac number, because 8165541557 - 2¹⁸ = 8165279413 is a prime.

It is a super-3 number, since 3×8165541557³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8165541551) 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, 66930608 + ... + 66930729.

It is an arithmetic number, because the mean of its divisors is an integer number (2074850739).

Almost surely, 2^8165541557 is an apocalyptic number.

It is an amenable number.

8165541557 is a deficient number, since it is larger than the sum of its proper divisors (133861399).

8165541557 is a wasteful number, since it uses less digits than its factorization.

8165541557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133861398.

The product of its digits is 840000, while the sum is 47.

The square root of 8165541557 is about 90363.3861527997. The cubic root of 8165541557 is about 2013.7010559539.

The spelling of 8165541557 in words is "eight billion, one hundred sixty-five million, five hundred forty-one thousand, five hundred fifty-seven".