51510204002 has 4 divisors (see below), whose sum is σ = 77265306006. Its totient is φ = 25755102000.

The previous prime is 51510203963. The next prime is 51510204013. The reversal of 51510204002 is 20040201515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31637381161 + 19872822841 = 177869^2 + 140971^2 .

It is a super-2 number, since 2×51510204002² (a number of 22 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 12877550999 + ... + 12877551002.

Almost surely, 2^51510204002 is an apocalyptic number.

51510204002 is a deficient number, since it is larger than the sum of its proper divisors (25755102004).

51510204002 is a wasteful number, since it uses less digits than its factorization.

51510204002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25755102003.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 51510204002 its reverse (20040201515), we get a palindrome (71550405517).

The spelling of 51510204002 in words is "fifty-one billion, five hundred ten million, two hundred four thousand, two".