51465913380 has 192 divisors, whose sum is σ = 187453647360. Its totient is φ = 11476684800.

The previous prime is 51465913379. The next prime is 51465913381. The reversal of 51465913380 is 8331956415.

51465913380 is a `hidden beast` number, since 51 + 4 + 6 + 591 + 3 + 3 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51465913379) and next prime (51465913381).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (51465913381) 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 63 ways as a sum of consecutive naturals, for example, 11061 + ... + 321020.

It is an arithmetic number, because the mean of its divisors is an integer number (976321080).

Almost surely, 2^51465913380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51465913380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93726823680).

51465913380 is an abundant number, since it is smaller than the sum of its proper divisors (135987733980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51465913380 is a wasteful number, since it uses less digits than its factorization.

51465913380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332147 (or 332139 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 51465913380 in words is "fifty-one billion, four hundred sixty-five million, nine hundred thirteen thousand, three hundred eighty".