87186516451 has 2 divisors, whose sum is σ = 87186516452. Its totient is φ = 87186516450.

The previous prime is 87186516449. The next prime is 87186516623. The reversal of 87186516451 is 15461568178.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87186516451 - 2¹ = 87186516449 is a prime.

Together with 87186516449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87186516751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43593258225 + 43593258226.

It is an arithmetic number, because the mean of its divisors is an integer number (43593258226).

Almost surely, 2^87186516451 is an apocalyptic number.

87186516451 is a deficient number, since it is larger than the sum of its proper divisors (1).

87186516451 is an equidigital number, since it uses as much as digits as its factorization.

87186516451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1612800, while the sum is 52.

The spelling of 87186516451 in words is "eighty-seven billion, one hundred eighty-six million, five hundred sixteen thousand, four hundred fifty-one".