51515301242 has 32 divisors (see below), whose sum is σ = 82476878400. Its totient is φ = 24088176000.

The previous prime is 51515301239. The next prime is 51515301281. The reversal of 51515301242 is 24210351515.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

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, 252617 + ... + 408467.

It is an arithmetic number, because the mean of its divisors is an integer number (2577402450).

Almost surely, 2^51515301242 is an apocalyptic number.

51515301242 is a deficient number, since it is larger than the sum of its proper divisors (30961577158).

51515301242 is a wasteful number, since it uses less digits than its factorization.

51515301242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156062.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 51515301242 its reverse (24210351515), we get a palindrome (75725652757).

The spelling of 51515301242 in words is "fifty-one billion, five hundred fifteen million, three hundred one thousand, two hundred forty-two".