87905217501 has 6 divisors (see below), whose sum is σ = 126974203070. Its totient is φ = 58603478328.

The previous prime is 87905217481. The next prime is 87905217559. The reversal of 87905217501 is 10571250978.

87905217501 is a `hidden beast` number, since 8 + 7 + 90 + 52 + 1 + 7 + 501 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68682781476 + 19222436025 = 262074^2 + 138645^2 .

It is not a de Polignac number, because 87905217501 - 2¹⁸ = 87904955357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87905210501) 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 in 5 ways as a sum of consecutive naturals, for example, 4883623186 + ... + 4883623203.

Almost surely, 2^87905217501 is an apocalyptic number.

It is an amenable number.

87905217501 is a deficient number, since it is larger than the sum of its proper divisors (39068985569).

87905217501 is a wasteful number, since it uses less digits than its factorization.

87905217501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9767246395 (or 9767246392 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 45.

The spelling of 87905217501 in words is "eighty-seven billion, nine hundred five million, two hundred seventeen thousand, five hundred one".