65520661500 has 144 divisors (see below), whose sum is σ = 236223938496. Its totient is φ = 14976144000.

The previous prime is 65520661487. The next prime is 65520661501. The reversal of 65520661500 is 516602556.

It is a happy number.

65520661500 is a `hidden beast` number, since 65 + 520 + 66 + 15 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65520661501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1008511 + ... + 1071510.

Almost surely, 2^65520661500 is an apocalyptic number.

65520661500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65520661500 is an abundant number, since it is smaller than the sum of its proper divisors (170703276996).

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

65520661500 is a wasteful number, since it uses less digits than its factorization.

65520661500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080053 (or 2080038 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 65520661500 in words is "sixty-five billion, five hundred twenty million, six hundred sixty-one thousand, five hundred".