51437987738 has 4 divisors (see below), whose sum is σ = 77156981610. Its totient is φ = 25718993868.

The previous prime is 51437987719. The next prime is 51437987767. The reversal of 51437987738 is 83778973415.

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., 38940312889 + 12497674849 = 197333^2 + 111793^2 .

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, 12859496933 + ... + 12859496936.

Almost surely, 2^51437987738 is an apocalyptic number.

51437987738 is a deficient number, since it is larger than the sum of its proper divisors (25718993872).

51437987738 is a wasteful number, since it uses less digits than its factorization.

51437987738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25718993871.

The product of its digits is 35562240, while the sum is 62.

The spelling of 51437987738 in words is "fifty-one billion, four hundred thirty-seven million, nine hundred eighty-seven thousand, seven hundred thirty-eight".