65978011 has 4 divisors (see below), whose sum is σ = 71976024. Its totient is φ = 59980000.

The previous prime is 65978009. The next prime is 65978047. The reversal of 65978011 is 11087956.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65978011 - 2¹ = 65978009 is a prime.

It is a super-2 number, since 2×65978011² = 8706195871032242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65978911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2998990 + ... + 2999011.

It is an arithmetic number, because the mean of its divisors is an integer number (17994006).

Almost surely, 2^65978011 is an apocalyptic number.

65978011 is a deficient number, since it is larger than the sum of its proper divisors (5998013).

65978011 is a wasteful number, since it uses less digits than its factorization.

65978011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998012.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 65978011 is about 8122.6849624985. The cubic root of 65978011 is about 404.0791168615.

The spelling of 65978011 in words is "sixty-five million, nine hundred seventy-eight thousand, eleven".