65618643 has 4 divisors (see below), whose sum is σ = 87491528. Its totient is φ = 43745760.

The previous prime is 65618633. The next prime is 65618669. The reversal of 65618643 is 34681656.

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

It is not a de Polignac number, because 65618643 - 2¹² = 65614547 is a prime.

It is a super-2 number, since 2×65618643² = 8611612618322898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65618633) 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, 10936438 + ... + 10936443.

It is an arithmetic number, because the mean of its divisors is an integer number (21872882).

Almost surely, 2^65618643 is an apocalyptic number.

65618643 is a deficient number, since it is larger than the sum of its proper divisors (21872885).

65618643 is a wasteful number, since it uses less digits than its factorization.

65618643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21872884.

The product of its digits is 103680, while the sum is 39.

The square root of 65618643 is about 8100.5335009492. The cubic root of 65618643 is about 403.3441368749.

The spelling of 65618643 in words is "sixty-five million, six hundred eighteen thousand, six hundred forty-three".