51538975546 has 4 divisors (see below), whose sum is σ = 77308463322. Its totient is φ = 25769487772.

The previous prime is 51538975541. The next prime is 51538975549. The reversal of 51538975546 is 64557983515.

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., 50238291321 + 1300684225 = 224139^2 + 36065^2 .

It is not an unprimeable number, because it can be changed into a prime (51538975541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12884743885 + ... + 12884743888.

Almost surely, 2^51538975546 is an apocalyptic number.

51538975546 is a deficient number, since it is larger than the sum of its proper divisors (25769487776).

51538975546 is a wasteful number, since it uses less digits than its factorization.

51538975546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25769487775.

The product of its digits is 22680000, while the sum is 58.

The spelling of 51538975546 in words is "fifty-one billion, five hundred thirty-eight million, nine hundred seventy-five thousand, five hundred forty-six".