76473818521 has 9 divisors (see below), whose sum is σ = 81241887999. Its totient is φ = 71970933984.

The previous prime is 76473818507. The next prime is 76473818537. The reversal of 76473818521 is 12581837467.

The square root of 76473818521 is 276539.

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

It can be written as a sum of positive squares in only one way, i.e., 59538440025 + 16935378496 = 244005^2 + 130136^2 .

It is not a de Polignac number, because 76473818521 - 2¹⁵ = 76473785753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76473818591) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4693030 + ... + 4709296.

Almost surely, 2^76473818521 is an apocalyptic number.

76473818521 is the 276539-th square number.

76473818521 is the 138270-th centered octagonal number.

It is an amenable number.

76473818521 is a deficient number, since it is larger than the sum of its proper divisors (4768069478).

76473818521 is an frugal number, since it uses more digits than its factorization.

76473818521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32568 (or 16284 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 52.

The spelling of 76473818521 in words is "seventy-six billion, four hundred seventy-three million, eight hundred eighteen thousand, five hundred twenty-one".