73143565640 has 16 divisors (see below), whose sum is σ = 164573022780. Its totient is φ = 29257426240.

The previous prime is 73143565639. The next prime is 73143565643. The reversal of 73143565640 is 4656534137.

It can be written as a sum of positive squares in 2 ways, for example, as 70816660996 + 2326904644 = 266114^2 + 48238^2 .

It is a junction number, because it is equal to n+sod(n) for n = 73143565591 and 73143565600.

It is not an unprimeable number, because it can be changed into a prime (73143565643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914294531 + ... + 914294610.

Almost surely, 2^73143565640 is an apocalyptic number.

It is an amenable number.

73143565640 is an abundant number, since it is smaller than the sum of its proper divisors (91429457140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73143565640 is a wasteful number, since it uses less digits than its factorization.

73143565640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828589152 (or 1828589148 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 73143565640 in words is "seventy-three billion, one hundred forty-three million, five hundred sixty-five thousand, six hundred forty".