87640622477 has 2 divisors, whose sum is σ = 87640622478. Its totient is φ = 87640622476.

The previous prime is 87640622417. The next prime is 87640622483. The reversal of 87640622477 is 77422604678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86654285641 + 986336836 = 294371^2 + 31406^2 .

It is a cyclic number.

It is not a de Polignac number, because 87640622477 - 2¹⁴ = 87640606093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87640622417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43820311238 + 43820311239.

It is an arithmetic number, because the mean of its divisors is an integer number (43820311239).

Almost surely, 2^87640622477 is an apocalyptic number.

It is an amenable number.

87640622477 is a deficient number, since it is larger than the sum of its proper divisors (1).

87640622477 is an equidigital number, since it uses as much as digits as its factorization.

87640622477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6322176, while the sum is 53.

The spelling of 87640622477 in words is "eighty-seven billion, six hundred forty million, six hundred twenty-two thousand, four hundred seventy-seven".