65647537389 has 18 divisors (see below), whose sum is σ = 110305726830. Its totient is φ = 37512878256.

The previous prime is 65647537369. The next prime is 65647537391. The reversal of 65647537389 is 98373574656.

65647537389 is a `hidden beast` number, since 6 + 5 + 64 + 7 + 537 + 38 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40854515625 + 24793021764 = 202125^2 + 157458^2 .

It is not a de Polignac number, because 65647537389 - 2¹² = 65647533293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65647537369) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 74429874 + ... + 74430755.

It is an arithmetic number, because the mean of its divisors is an integer number (6128095935).

Almost surely, 2^65647537389 is an apocalyptic number.

It is an amenable number.

65647537389 is a deficient number, since it is larger than the sum of its proper divisors (44658189441).

65647537389 is a wasteful number, since it uses less digits than its factorization.

65647537389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148860649 (or 148860639 counting only the distinct ones).

The product of its digits is 114307200, while the sum is 63.

The spelling of 65647537389 in words is "sixty-five billion, six hundred forty-seven million, five hundred thirty-seven thousand, three hundred eighty-nine".