51809000253 has 64 divisors (see below), whose sum is σ = 76052275200. Its totient is φ = 31259208960.

The previous prime is 51809000251. The next prime is 51809000293. The reversal of 51809000253 is 35200090815.

51809000253 is a nontrivial binomial coefficient, being equal to C(321898, 2).

It is not a de Polignac number, because 51809000253 - 2¹ = 51809000251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51809000251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29452788 + ... + 29454546.

It is an arithmetic number, because the mean of its divisors is an integer number (1188316800).

Almost surely, 2^51809000253 is an apocalyptic number.

51809000253 is the 321897-th triangular number and also the 160949-th hexagonal number.

It is an amenable number.

51809000253 is a deficient number, since it is larger than the sum of its proper divisors (24243274947).

51809000253 is a wasteful number, since it uses less digits than its factorization.

51809000253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082.

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 51809000253 in words is "fifty-one billion, eight hundred nine million, two hundred fifty-three", and thus it is an aban number.