65520276840 has 128 divisors (see below), whose sum is σ = 218840400000. Its totient is φ = 17436916224.

The previous prime is 65520276823. The next prime is 65520276859. The reversal of 65520276840 is 4867202556.

65520276840 is a `hidden beast` number, since 6 + 5 + 520 + 27 + 68 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 478132 + ... + 599708.

It is an arithmetic number, because the mean of its divisors is an integer number (1709690625).

Almost surely, 2^65520276840 is an apocalyptic number.

65520276840 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 65520276840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109420200000).

65520276840 is an abundant number, since it is smaller than the sum of its proper divisors (153320123160).

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

65520276840 is a wasteful number, since it uses less digits than its factorization.

65520276840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122096 (or 122086 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 65520276840 in words is "sixty-five billion, five hundred twenty million, two hundred seventy-six thousand, eight hundred forty".