65541978 has 12 divisors (see below), whose sum is σ = 142007658. Its totient is φ = 21847320.

The previous prime is 65541947. The next prime is 65541991. The reversal of 65541978 is 87914556.

65541978 is a `hidden beast` number, since 6 + 554 + 1 + 97 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 41951529 + 23590449 = 6477^2 + 4857^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1820593 + ... + 1820628.

Almost surely, 2^65541978 is an apocalyptic number.

65541978 is an abundant number, since it is smaller than the sum of its proper divisors (76465680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65541978 is a wasteful number, since it uses less digits than its factorization.

65541978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641229 (or 3641226 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 65541978 is about 8095.8000222338. The cubic root of 65541978 is about 403.1869943958.

The spelling of 65541978 in words is "sixty-five million, five hundred forty-one thousand, nine hundred seventy-eight".