73962785521 has 9 divisors (see below), whose sum is σ = 74252465049. Its totient is φ = 73674234900.

The previous prime is 73962785473. The next prime is 73962785527. The reversal of 73962785521 is 12558726937.

The square root of 73962785521 is 271961.

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

It is not a de Polignac number, because 73962785521 - 2⁹ = 73962785009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73962785527) 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, 117214876 + ... + 117215506.

Almost surely, 2^73962785521 is an apocalyptic number.

73962785521 is the 271961-st square number.

73962785521 is the 135981-st centered octagonal number.

It is an amenable number.

73962785521 is a deficient number, since it is larger than the sum of its proper divisors (289679528).

73962785521 is an frugal number, since it uses more digits than its factorization.

73962785521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124 (or 1062 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 55.

The spelling of 73962785521 in words is "seventy-three billion, nine hundred sixty-two million, seven hundred eighty-five thousand, five hundred twenty-one".