51423920187 has 8 divisors (see below), whose sum is σ = 68590252560. Its totient is φ = 34270100640.

The previous prime is 51423920137. The next prime is 51423920231. The reversal of 51423920187 is 78102932415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51423920187 - 2⁷ = 51423920059 is a prime.

It is a super-2 number, since 2×51423920187² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51423920137) 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 7 ways as a sum of consecutive naturals, for example, 3118612 + ... + 3135057.

It is an arithmetic number, because the mean of its divisors is an integer number (8573781570).

Almost surely, 2^51423920187 is an apocalyptic number.

51423920187 is a deficient number, since it is larger than the sum of its proper divisors (17166332373).

51423920187 is a wasteful number, since it uses less digits than its factorization.

51423920187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6256413.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 51423920187 in words is "fifty-one billion, four hundred twenty-three million, nine hundred twenty thousand, one hundred eighty-seven".