87520820735547 has 6 divisors (see below), whose sum is σ = 126418963284692. Its totient is φ = 58347213823692.

The previous prime is 87520820735519. The next prime is 87520820735581. The reversal of 87520820735547 is 74553702802578.

It is a happy number.

87520820735547 is a `hidden beast` number, since 8 + 7 + 5 + 2 + 0 + 8 + 2 + 0 + 73 + 554 + 7 = 666.

It is not a de Polignac number, because 87520820735547 - 2⁸ = 87520820735291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87520820735507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4862267818633 + ... + 4862267818650.

Almost surely, 2^{87520820735547} is an apocalyptic number.

87520820735547 is a deficient number, since it is larger than the sum of its proper divisors (38898142549145).

87520820735547 is a wasteful number, since it uses less digits than its factorization.

87520820735547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9724535637289 (or 9724535637286 counting only the distinct ones).

The product of its (nonzero) digits is 131712000, while the sum is 63.

The spelling of 87520820735547 in words is "eighty-seven trillion, five hundred twenty billion, eight hundred twenty million, seven hundred thirty-five thousand, five hundred forty-seven".