51998450409 has 12 divisors (see below), whose sum is σ = 79527042036. Its totient is φ = 32626478592.

The previous prime is 51998450381. The next prime is 51998450419. The reversal of 51998450409 is 90405489915.

51998450409 is a `hidden beast` number, since 5 + 199 + 8 + 45 + 0 + 409 = 666.

51998450409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 44624450025 + 7374000384 = 211245^2 + 85872^2 .

It is not a de Polignac number, because 51998450409 - 2¹¹ = 51998448361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51998450419) 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, 169929424 + ... + 169929729.

It is an arithmetic number, because the mean of its divisors is an integer number (6627253503).

Almost surely, 2^51998450409 is an apocalyptic number.

It is an amenable number.

51998450409 is a deficient number, since it is larger than the sum of its proper divisors (27528591627).

51998450409 is a wasteful number, since it uses less digits than its factorization.

51998450409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339859176 (or 339859173 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 51998450409 in words is "fifty-one billion, nine hundred ninety-eight million, four hundred fifty thousand, four hundred nine".