65505704999978 has 16 divisors (see below), whose sum is σ = 99201141119520. Its totient is φ = 32438907226800.

The previous prime is 65505704999957. The next prime is 65505705000011. The reversal of 65505704999978 is 87999940750556.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65505704999896 and 65505704999905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61789808 + ... + 62841003.

It is an arithmetic number, because the mean of its divisors is an integer number (6200071319970).

Almost surely, 2^{65505704999978} is an apocalyptic number.

65505704999978 is a deficient number, since it is larger than the sum of its proper divisors (33695436119542).

65505704999978 is a wasteful number, since it uses less digits than its factorization.

65505704999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124633333.

The product of its (nonzero) digits is 7715736000, while the sum is 83.

The spelling of 65505704999978 in words is "sixty-five trillion, five hundred five billion, seven hundred four million, nine hundred ninety-nine thousand, nine hundred seventy-eight".