65651563 has 4 divisors (see below), whose sum is σ = 67915440. Its totient is φ = 63387688.

The previous prime is 65651561. The next prime is 65651581. The reversal of 65651563 is 36515656.

It is a happy number.

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 65651563 - 2¹ = 65651561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65651561) 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, 1131895 + ... + 1131952.

It is an arithmetic number, because the mean of its divisors is an integer number (16978860).

Almost surely, 2^65651563 is an apocalyptic number.

65651563 is a deficient number, since it is larger than the sum of its proper divisors (2263877).

65651563 is a wasteful number, since it uses less digits than its factorization.

65651563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263876.

The product of its digits is 81000, while the sum is 37.

The square root of 65651563 is about 8102.5652110921. The cubic root of 65651563 is about 403.4115763937.

It can be divided in two parts, 6565 and 1563, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 65651563 in words is "sixty-five million, six hundred fifty-one thousand, five hundred sixty-three".