65880813 has 4 divisors (see below), whose sum is σ = 87841088. Its totient is φ = 43920540.

The previous prime is 65880803. The next prime is 65880827. The reversal of 65880813 is 31808856.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65880813 - 2¹⁸ = 65618669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65880803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10980133 + ... + 10980138.

It is an arithmetic number, because the mean of its divisors is an integer number (21960272).

Almost surely, 2^65880813 is an apocalyptic number.

It is an amenable number.

65880813 is a deficient number, since it is larger than the sum of its proper divisors (21960275).

65880813 is a wasteful number, since it uses less digits than its factorization.

65880813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21960274.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 65880813 is about 8116.6996371678. The cubic root of 65880813 is about 403.8805912011.

The spelling of 65880813 in words is "sixty-five million, eight hundred eighty thousand, eight hundred thirteen".