73203254721 has 9 divisors (see below), whose sum is σ = 105739207041. Its totient is φ = 48801628692.

The previous prime is 73203254693. The next prime is 73203254731. The reversal of 73203254721 is 12745230237.

The square root of 73203254721 is 270561.

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

73203254721 is a `hidden beast` number, since 7 + 320 + 325 + 4 + 7 + 2 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 73203254721 - 2²⁷ = 73069036993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73203254731) 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, 766590 + ... + 856776.

Almost surely, 2^73203254721 is an apocalyptic number.

73203254721 is the 270561-st square number.

73203254721 is the 135281-st centered octagonal number.

It is an amenable number.

73203254721 is a deficient number, since it is larger than the sum of its proper divisors (32535952320).

73203254721 is an frugal number, since it uses more digits than its factorization.

73203254721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180380 (or 90190 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

Multiplying 73203254721 by its sum of digits (36), we get a square (2635317169956 = 1623366²).

Adding to 73203254721 its reverse (12745230237), we get a palindrome (85948484958).

The spelling of 73203254721 in words is "seventy-three billion, two hundred three million, two hundred fifty-four thousand, seven hundred twenty-one".