87166417791 has 16 divisors (see below), whose sum is σ = 116811192960. Its totient is φ = 57816650400.

The previous prime is 87166417787. The next prime is 87166417801. The reversal of 87166417791 is 19771466178.

It is a happy number.

It is not a de Polignac number, because 87166417791 - 2² = 87166417787 is a prime.

It is a super-2 number, since 2×87166417791² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87166417721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 953116 + ... + 1040558.

It is an arithmetic number, because the mean of its divisors is an integer number (7300699560).

Almost surely, 2^87166417791 is an apocalyptic number.

87166417791 is a deficient number, since it is larger than the sum of its proper divisors (29644775169).

87166417791 is a wasteful number, since it uses less digits than its factorization.

87166417791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89126.

The product of its digits is 3556224, while the sum is 57.

The spelling of 87166417791 in words is "eighty-seven billion, one hundred sixty-six million, four hundred seventeen thousand, seven hundred ninety-one".