51215066430 has 32 divisors (see below), whose sum is σ = 134090356608. Its totient is φ = 12415773600.

The previous prime is 51215066429. The next prime is 51215066431. The reversal of 51215066430 is 3466051215.

It is an interprime number because it is at equal distance from previous prime (51215066429) and next prime (51215066431).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 51215066391 and 51215066400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215066431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77598256 + ... + 77598915.

It is an arithmetic number, because the mean of its divisors is an integer number (4190323644).

Almost surely, 2^51215066430 is an apocalyptic number.

51215066430 is an abundant number, since it is smaller than the sum of its proper divisors (82875290178).

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

51215066430 is a wasteful number, since it uses less digits than its factorization.

51215066430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155197192.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 51215066430 in words is "fifty-one billion, two hundred fifteen million, sixty-six thousand, four hundred thirty".