51615945644 has 6 divisors (see below), whose sum is σ = 90327904884. Its totient is φ = 25807972820.

The previous prime is 51615945643. The next prime is 51615945697. The reversal of 51615945644 is 44654951615.

It is a junction number, because it is equal to n+sod(n) for n = 51615945592 and 51615945601.

It is not an unprimeable number, because it can be changed into a prime (51615945643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6451993202 + ... + 6451993209.

It is an arithmetic number, because the mean of its divisors is an integer number (15054650814).

Almost surely, 2^51615945644 is an apocalyptic number.

It is an amenable number.

51615945644 is a deficient number, since it is larger than the sum of its proper divisors (38711959240).

51615945644 is a wasteful number, since it uses less digits than its factorization.

51615945644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12903986415 (or 12903986413 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 50.

The spelling of 51615945644 in words is "fifty-one billion, six hundred fifteen million, nine hundred forty-five thousand, six hundred forty-four".