87535465769521 has 27 divisors (see below), whose sum is σ = 111926434054617. Its totient is φ = 68208892484040.

The previous prime is 87535465769443. The next prime is 87535465769569. The reversal of 87535465769521 is 12596756453578.

The square root of 87535465769521 is 9356039.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 87535465769521 - 2²¹ = 87535463672369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87535465769581) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 720354250 + ... + 720475756.

Almost surely, 2^{87535465769521} is an apocalyptic number.

87535465769521 is the 9356039-th square number.

87535465769521 is the 4678020-th centered octagonal number.

It is an amenable number.

87535465769521 is a deficient number, since it is larger than the sum of its proper divisors (24390968285096).

87535465769521 is an frugal number, since it uses more digits than its factorization.

87535465769521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243050 (or 121525 counting only the distinct ones).

The product of its digits is 1905120000, while the sum is 73.

The spelling of 87535465769521 in words is "eighty-seven trillion, five hundred thirty-five billion, four hundred sixty-five million, seven hundred sixty-nine thousand, five hundred twenty-one".