65490543800 has 48 divisors (see below), whose sum is σ = 166107839400. Its totient is φ = 23814742400.

The previous prime is 65490543791. The next prime is 65490543809. The reversal of 65490543800 is 834509456.

It is an interprime number because it is at equal distance from previous prime (65490543791) and next prime (65490543809).

It is a super-2 number, since 2×65490543800² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65490543809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14882015 + ... + 14886414.

Almost surely, 2^65490543800 is an apocalyptic number.

It is an amenable number.

65490543800 is an abundant number, since it is smaller than the sum of its proper divisors (100617295600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65490543800 is a wasteful number, since it uses less digits than its factorization.

65490543800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29768456 (or 29768447 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 65490543800 in words is "sixty-five billion, four hundred ninety million, five hundred forty-three thousand, eight hundred".