73973664361 has 3 divisors (see below), whose sum is σ = 73973936343. Its totient is φ = 73973392380.

The previous prime is 73973664341. The next prime is 73973664389. The reversal of 73973664361 is 16346637937.

It is a happy number.

The square root of 73973664361 is 271981.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16346637937 = 7 ⋅2335233991.

It can be written as a sum of positive squares in only one way, i.e., 61612671961 + 12360992400 = 248219^2 + 111180^2 .

It is not a de Polignac number, because 73973664361 - 2⁵ = 73973664329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73973664341) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 135991 + ... + 407971.

It is an arithmetic number, because the mean of its divisors is an integer number (24657978781).

Almost surely, 2^73973664361 is an apocalyptic number.

73973664361 is the 271981-st square number.

73973664361 is the 135991-st centered octagonal number.

It is an amenable number.

73973664361 is a deficient number, since it is larger than the sum of its proper divisors (271982).

73973664361 is an frugal number, since it uses more digits than its factorization.

73973664361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543962 (or 271981 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 55.

The spelling of 73973664361 in words is "seventy-three billion, nine hundred seventy-three million, six hundred sixty-four thousand, three hundred sixty-one".