71807818450 has 24 divisors (see below), whose sum is σ = 137172344292. Its totient is φ = 27946825920.

The previous prime is 71807818421. The next prime is 71807818451. The reversal of 71807818450 is 5481870817.

It can be written as a sum of positive squares in 6 ways, for example, as 33203035089 + 38604783361 = 182217^2 + 196481^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71807818394 and 71807818403.

It is not an unprimeable number, because it can be changed into a prime (71807818451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19405669 + ... + 19409368.

Almost surely, 2^71807818450 is an apocalyptic number.

71807818450 is a deficient number, since it is larger than the sum of its proper divisors (65364525842).

71807818450 is a wasteful number, since it uses less digits than its factorization.

71807818450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38815086 (or 38815081 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 49.

The spelling of 71807818450 in words is "seventy-one billion, eight hundred seven million, eight hundred eighteen thousand, four hundred fifty".