87800111857 has 2 divisors, whose sum is σ = 87800111858. Its totient is φ = 87800111856.

The previous prime is 87800111809. The next prime is 87800111909. The reversal of 87800111857 is 75811100878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64212066801 + 23588045056 = 253401^2 + 153584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87800111857 is a prime.

It is not a weakly prime, because it can be changed into another prime (87800111807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43900055928 + 43900055929.

It is an arithmetic number, because the mean of its divisors is an integer number (43900055929).

Almost surely, 2^87800111857 is an apocalyptic number.

It is an amenable number.

87800111857 is a deficient number, since it is larger than the sum of its proper divisors (1).

87800111857 is an equidigital number, since it uses as much as digits as its factorization.

87800111857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 46.

The spelling of 87800111857 in words is "eighty-seven billion, eight hundred million, one hundred eleven thousand, eight hundred fifty-seven".