87081557069 has 4 divisors (see below), whose sum is σ = 93780138396. Its totient is φ = 80382975744.

The previous prime is 87081557063. The next prime is 87081557071. The reversal of 87081557069 is 96075518078.

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 23643060169 + 63438496900 = 153763^2 + 251870^2 .

It is a cyclic number.

It is not a de Polignac number, because 87081557069 - 2¹⁶ = 87081491533 is a prime.

It is a super-2 number, since 2×87081557069² (a number of 23 digits) contains 22 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 (87081557063) 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, 3349290644 + ... + 3349290669.

It is an arithmetic number, because the mean of its divisors is an integer number (23445034599).

Almost surely, 2^87081557069 is an apocalyptic number.

It is an amenable number.

87081557069 is a deficient number, since it is larger than the sum of its proper divisors (6698581327).

87081557069 is a wasteful number, since it uses less digits than its factorization.

87081557069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6698581326.

The product of its (nonzero) digits is 4233600, while the sum is 56.

The spelling of 87081557069 in words is "eighty-seven billion, eighty-one million, five hundred fifty-seven thousand, sixty-nine".