51430635646 has 32 divisors (see below), whose sum is σ = 83941704000. Its totient is φ = 23491607040.

The previous prime is 51430635643. The next prime is 51430635671. The reversal of 51430635646 is 64653603415.

It is a super-2 number, since 2×51430635646² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51430635643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2486455 + ... + 2507053.

It is an arithmetic number, because the mean of its divisors is an integer number (2623178250).

Almost surely, 2^51430635646 is an apocalyptic number.

51430635646 is a deficient number, since it is larger than the sum of its proper divisors (32511068354).

51430635646 is a wasteful number, since it uses less digits than its factorization.

51430635646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21604.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 51430635646 in words is "fifty-one billion, four hundred thirty million, six hundred thirty-five thousand, six hundred forty-six".