51980252738 has 4 divisors (see below), whose sum is σ = 77970379110. Its totient is φ = 25990126368.

The previous prime is 51980252699. The next prime is 51980252809. The reversal of 51980252738 is 83725208915.

It is a happy number.

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., 33427905889 + 18552346849 = 182833^2 + 136207^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12995063183 + ... + 12995063186.

Almost surely, 2^51980252738 is an apocalyptic number.

51980252738 is a deficient number, since it is larger than the sum of its proper divisors (25990126372).

51980252738 is a wasteful number, since it uses less digits than its factorization.

51980252738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25990126371.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 51980252738 in words is "fifty-one billion, nine hundred eighty million, two hundred fifty-two thousand, seven hundred thirty-eight".