65540077678 has 8 divisors (see below), whose sum is σ = 98537161968. Its totient is φ = 32694357024.

The previous prime is 65540077661. The next prime is 65540077693. The reversal of 65540077678 is 87677004556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37839826 + ... + 37841557.

It is an arithmetic number, because the mean of its divisors is an integer number (12317145246).

Almost surely, 2^65540077678 is an apocalyptic number.

65540077678 is a deficient number, since it is larger than the sum of its proper divisors (32997084290).

65540077678 is a wasteful number, since it uses less digits than its factorization.

65540077678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75681818.

The product of its (nonzero) digits is 9878400, while the sum is 55.

The spelling of 65540077678 in words is "sixty-five billion, five hundred forty million, seventy-seven thousand, six hundred seventy-eight".