65916256775040 has 640 divisors, whose sum is σ = 284852422008000. Its totient is φ = 14180302651392.

The previous prime is 65916256775027. The next prime is 65916256775063. The reversal of 65916256775040 is 4057765261956.

It is a happy number.

65916256775040 is a `hidden beast` number, since 6 + 5 + 9 + 1 + 6 + 2 + 56 + 77 + 504 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 826386 + ... + 11511534.

Almost surely, 2^{65916256775040} is an apocalyptic number.

65916256775040 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 65916256775040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142426211004000).

65916256775040 is an abundant number, since it is smaller than the sum of its proper divisors (218936165232960).

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

65916256775040 is a wasteful number, since it uses less digits than its factorization.

65916256775040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10685204 (or 10685183 counting only the distinct ones).

The product of its (nonzero) digits is 95256000, while the sum is 63.

The spelling of 65916256775040 in words is "sixty-five trillion, nine hundred sixteen billion, two hundred fifty-six million, seven hundred seventy-five thousand, forty".