51420406645065 has 16 divisors (see below), whose sum is σ = 82275074009856. Its totient is φ = 27423409084800.

The previous prime is 51420406645057. The next prime is 51420406645087. The reversal of 51420406645065 is 56054660402415.

It is a happy number.

It is not a de Polignac number, because 51420406645065 - 2³ = 51420406645057 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49960641 + ... + 50979470.

It is an arithmetic number, because the mean of its divisors is an integer number (5142192125616).

Almost surely, 2^{51420406645065} is an apocalyptic number.

It is an amenable number.

51420406645065 is a deficient number, since it is larger than the sum of its proper divisors (30854667364791).

51420406645065 is a wasteful number, since it uses less digits than its factorization.

51420406645065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100974080.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 51420406645065 in words is "fifty-one trillion, four hundred twenty billion, four hundred six million, six hundred forty-five thousand, sixty-five".