65406819 has 4 divisors (see below), whose sum is σ = 87209096. Its totient is φ = 43604544.

The previous prime is 65406793. The next prime is 65406821. The reversal of 65406819 is 91860456.

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

It is not a de Polignac number, because 65406819 - 2⁹ = 65406307 is a prime.

It is a super-2 number, since 2×65406819² = 8556103943397522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65406829) 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, 10901134 + ... + 10901139.

It is an arithmetic number, because the mean of its divisors is an integer number (21802274).

Almost surely, 2^65406819 is an apocalyptic number.

65406819 is a deficient number, since it is larger than the sum of its proper divisors (21802277).

65406819 is a wasteful number, since it uses less digits than its factorization.

65406819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21802276.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 65406819 is about 8087.4482378560. The cubic root of 65406819 is about 402.9096563469.

The spelling of 65406819 in words is "sixty-five million, four hundred six thousand, eight hundred nineteen".