65097386640 has 480 divisors, whose sum is σ = 266362701696. Its totient is φ = 14566625280.

The previous prime is 65097386621. The next prime is 65097386647. The reversal of 65097386640 is 4668379056.

65097386640 is a `hidden beast` number, since 6 + 509 + 7 + 38 + 66 + 40 = 666.

It is a super-4 number, since 4×65097386640⁴ (a number of 44 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (65097386647) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2768212 + ... + 2791628.

Almost surely, 2^65097386640 is an apocalyptic number.

65097386640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65097386640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133181350848).

65097386640 is an abundant number, since it is smaller than the sum of its proper divisors (201265315056).

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

65097386640 is a wasteful number, since it uses less digits than its factorization.

65097386640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23469 (or 23451 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 65097386640 in words is "sixty-five billion, ninety-seven million, three hundred eighty-six thousand, six hundred forty".