87856540805123 has 16 divisors (see below), whose sum is σ = 90587655155712. Its totient is φ = 85156720740000.

The previous prime is 87856540805087. The next prime is 87856540805141. The reversal of 87856540805123 is 32150804565878.

It is a Cunningham number, because it is equal to 9373182²-1.

It is a cyclic number.

It is not a de Polignac number, because 87856540805123 - 2¹² = 87856540801027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87856540805723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402937793 + ... + 403155773.

It is an arithmetic number, because the mean of its divisors is an integer number (5661728447232).

Almost surely, 2^{87856540805123} is an apocalyptic number.

87856540805123 is a deficient number, since it is larger than the sum of its proper divisors (2731114350589).

87856540805123 is a wasteful number, since it uses less digits than its factorization.

87856540805123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289706.

The product of its (nonzero) digits is 64512000, while the sum is 62.

The spelling of 87856540805123 in words is "eighty-seven trillion, eight hundred fifty-six billion, five hundred forty million, eight hundred five thousand, one hundred twenty-three".