51515020142 has 16 divisors (see below), whose sum is σ = 77990487120. Its totient is φ = 25518390912.

The previous prime is 51515020121. The next prime is 51515020163. The reversal of 51515020142 is 24102051515.

It is an interprime number because it is at equal distance from previous prime (51515020121) and next prime (51515020163).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 479888 + ... + 577340.

It is an arithmetic number, because the mean of its divisors is an integer number (4874405445).

Almost surely, 2^51515020142 is an apocalyptic number.

51515020142 is a deficient number, since it is larger than the sum of its proper divisors (26475466978).

51515020142 is a wasteful number, since it uses less digits than its factorization.

51515020142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99907.

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 51515020142 its reverse (24102051515), we get a palindrome (75617071657).

The spelling of 51515020142 in words is "fifty-one billion, five hundred fifteen million, twenty thousand, one hundred forty-two".