87178258451 has 2 divisors, whose sum is σ = 87178258452. Its totient is φ = 87178258450.

The previous prime is 87178258441. The next prime is 87178258493. The reversal of 87178258451 is 15485287178.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87178258451 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (87178258421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43589129225 + 43589129226.

It is an arithmetic number, because the mean of its divisors is an integer number (43589129226).

Almost surely, 2^87178258451 is an apocalyptic number.

87178258451 is a deficient number, since it is larger than the sum of its proper divisors (1).

87178258451 is an equidigital number, since it uses as much as digits as its factorization.

87178258451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5017600, while the sum is 56.

The spelling of 87178258451 in words is "eighty-seven billion, one hundred seventy-eight million, two hundred fifty-eight thousand, four hundred fifty-one".