51804651361 has 12 divisors (see below), whose sum is σ = 55368903952. Its totient is φ = 48458150208.

The previous prime is 51804651347. The next prime is 51804651373. The reversal of 51804651361 is 16315640815.

It is not a de Polignac number, because 51804651361 - 2¹³ = 51804643169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51804651461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 502755 + ... + 596968.

Almost surely, 2^51804651361 is an apocalyptic number.

It is an amenable number.

51804651361 is a deficient number, since it is larger than the sum of its proper divisors (3564252591).

51804651361 is a wasteful number, since it uses less digits than its factorization.

51804651361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099920 (or 1099903 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 51804651361 in words is "fifty-one billion, eight hundred four million, six hundred fifty-one thousand, three hundred sixty-one".