87564461947 has 2 divisors, whose sum is σ = 87564461948. Its totient is φ = 87564461946.

The previous prime is 87564461939. The next prime is 87564461987. The reversal of 87564461947 is 74916446578.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87564461947 - 2³ = 87564461939 is a prime.

It is a super-2 number, since 2×87564461947² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87564461987) 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 as a sum of consecutive naturals, namely, 43782230973 + 43782230974.

It is an arithmetic number, because the mean of its divisors is an integer number (43782230974).

Almost surely, 2^87564461947 is an apocalyptic number.

87564461947 is a deficient number, since it is larger than the sum of its proper divisors (1).

87564461947 is an equidigital number, since it uses as much as digits as its factorization.

87564461947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 61.

The spelling of 87564461947 in words is "eighty-seven billion, five hundred sixty-four million, four hundred sixty-one thousand, nine hundred forty-seven".