65667497472 has 320 divisors, whose sum is σ = 202273125120. Its totient is φ = 21018009600.

The previous prime is 65667497447. The next prime is 65667497477. The reversal of 65667497472 is 27479476656.

It is a happy number.

65667497472 is a `hidden beast` number, since 6 + 5 + 6 + 6 + 74 + 97 + 472 = 666.

Its product of digits (106686720) is a multiple of the sum of its prime divisors (1920).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65667497477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36259447 + ... + 36261257.

It is an arithmetic number, because the mean of its divisors is an integer number (632103516).

Almost surely, 2^65667497472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65667497472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101136562560).

65667497472 is an abundant number, since it is smaller than the sum of its proper divisors (136605627648).

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

65667497472 is a wasteful number, since it uses less digits than its factorization.

65667497472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942 (or 1920 counting only the distinct ones).

The product of its digits is 106686720, while the sum is 63.

The spelling of 65667497472 in words is "sixty-five billion, six hundred sixty-seven million, four hundred ninety-seven thousand, four hundred seventy-two".