65649551643 has 24 divisors (see below), whose sum is σ = 102130850640. Its totient is φ = 40396034880.

The previous prime is 65649551623. The next prime is 65649551677. The reversal of 65649551643 is 34615594656.

65649551643 is a `hidden beast` number, since 6 + 5 + 6 + 49 + 551 + 6 + 43 = 666.

It is not a de Polignac number, because 65649551643 - 2¹⁰ = 65649550619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65649551643.

It is not an unprimeable number, because it can be changed into a prime (65649551623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1837813 + ... + 1873193.

It is an arithmetic number, because the mean of its divisors is an integer number (4255452110).

Almost surely, 2^65649551643 is an apocalyptic number.

65649551643 is a deficient number, since it is larger than the sum of its proper divisors (36481298997).

65649551643 is a wasteful number, since it uses less digits than its factorization.

65649551643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51259 (or 51256 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 54.

The spelling of 65649551643 in words is "sixty-five billion, six hundred forty-nine million, five hundred fifty-one thousand, six hundred forty-three".