51542840979 has 48 divisors (see below), whose sum is σ = 85363679232. Its totient is φ = 29357342784.

The previous prime is 51542840891. The next prime is 51542841011. The reversal of 51542840979 is 97904824515.

It is a happy number.

51542840979 is a `hidden beast` number, since 5 + 1 + 542 + 8 + 4 + 0 + 97 + 9 = 666.

It is not a de Polignac number, because 51542840979 - 2²³ = 51534452371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51542840579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47416974 + ... + 47418060.

It is an arithmetic number, because the mean of its divisors is an integer number (1778409984).

Almost surely, 2^51542840979 is an apocalyptic number.

51542840979 is a deficient number, since it is larger than the sum of its proper divisors (33820838253).

51542840979 is a wasteful number, since it uses less digits than its factorization.

51542840979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856 (or 2853 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 51542840979 in words is "fifty-one billion, five hundred forty-two million, eight hundred forty thousand, nine hundred seventy-nine".