51405989469 has 8 divisors (see below), whose sum is σ = 68542436160. Its totient is φ = 34270101216.

The previous prime is 51405989449. The next prime is 51405989497. The reversal of 51405989469 is 96498950415.

51405989469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51405989469 - 2⁹ = 51405988957 is a prime.

It is a super-2 number, since 2×51405989469² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51405989419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179169 + ... + 367305.

It is an arithmetic number, because the mean of its divisors is an integer number (8567804520).

Almost surely, 2^51405989469 is an apocalyptic number.

It is an amenable number.

51405989469 is a deficient number, since it is larger than the sum of its proper divisors (17136446691).

51405989469 is a wasteful number, since it uses less digits than its factorization.

51405989469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279219.

The product of its (nonzero) digits is 13996800, while the sum is 60.

The spelling of 51405989469 in words is "fifty-one billion, four hundred five million, nine hundred eighty-nine thousand, four hundred sixty-nine".