65540697600 has 960 divisors, whose sum is σ = 267667868160. Its totient is φ = 13801881600.

The previous prime is 65540697587. The next prime is 65540697613. The reversal of 65540697600 is 679604556.

It is an interprime number because it is at equal distance from previous prime (65540697587) and next prime (65540697613).

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 65540697600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 209395044 + ... + 209395356.

It is an arithmetic number, because the mean of its divisors is an integer number (278820696).

Almost surely, 2^65540697600 is an apocalyptic number.

65540697600 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 65540697600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133833934080).

65540697600 is an abundant number, since it is smaller than the sum of its proper divisors (202127170560).

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

65540697600 is a wasteful number, since it uses less digits than its factorization.

65540697600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 48.

The spelling of 65540697600 in words is "sixty-five billion, five hundred forty million, six hundred ninety-seven thousand, six hundred".