87912121161577 has 4 divisors (see below), whose sum is σ = 88046749219140. Its totient is φ = 87777493104016.

The previous prime is 87912121161559. The next prime is 87912121161587. The reversal of 87912121161577 is 77516112121978.

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 19570882362201 + 68341238799376 = 4423899^2 + 8266876^2 .

It is a cyclic number.

It is not a de Polignac number, because 87912121161577 - 2³⁵ = 87877761423209 is a prime.

It is a super-2 number, since 2×87912121161577² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87912121161587) 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, 67314027802 + ... + 67314029107.

It is an arithmetic number, because the mean of its divisors is an integer number (22011687304785).

Almost surely, 2^{87912121161577} is an apocalyptic number.

It is an amenable number.

87912121161577 is a deficient number, since it is larger than the sum of its proper divisors (134628057563).

87912121161577 is a wasteful number, since it uses less digits than its factorization.

87912121161577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134628057562.

The product of its digits is 2963520, while the sum is 58.

The spelling of 87912121161577 in words is "eighty-seven trillion, nine hundred twelve billion, one hundred twenty-one million, one hundred sixty-one thousand, five hundred seventy-seven".