51215053530 has 64 divisors (see below), whose sum is σ = 125985507840. Its totient is φ = 13318408704.

The previous prime is 51215053507. The next prime is 51215053559. The reversal of 51215053530 is 3535051215.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 325006 + ... + 456134.

It is an arithmetic number, because the mean of its divisors is an integer number (1968523560).

Almost surely, 2^51215053530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51215053530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62992753920).

51215053530 is an abundant number, since it is smaller than the sum of its proper divisors (74770454310).

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

51215053530 is a wasteful number, since it uses less digits than its factorization.

51215053530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131463.

The product of its (nonzero) digits is 11250, while the sum is 30.

The spelling of 51215053530 in words is "fifty-one billion, two hundred fifteen million, fifty-three thousand, five hundred thirty".