51438931476 has 12 divisors (see below), whose sum is σ = 120024173472. Its totient is φ = 17146310488.

The previous prime is 51438931471. The next prime is 51438931493. The reversal of 51438931476 is 67413983415.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51438931471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2143288800 + ... + 2143288823.

It is an arithmetic number, because the mean of its divisors is an integer number (10002014456).

Almost surely, 2^51438931476 is an apocalyptic number.

It is an amenable number.

51438931476 is an abundant number, since it is smaller than the sum of its proper divisors (68585241996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51438931476 is a wasteful number, since it uses less digits than its factorization.

51438931476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286577630 (or 4286577628 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The spelling of 51438931476 in words is "fifty-one billion, four hundred thirty-eight million, nine hundred thirty-one thousand, four hundred seventy-six".