64535637780 has 72 divisors (see below), whose sum is σ = 202508397000. Its totient is φ = 16616070912.

The previous prime is 64535637773. The next prime is 64535637781. The reversal of 64535637780 is 8773653546.

64535637780 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 563 + 7 + 78 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26749584 + 64508888196 = 5172^2 + 253986^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64535637781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6176355 + ... + 6186794.

It is an arithmetic number, because the mean of its divisors is an integer number (2812616625).

Almost surely, 2^64535637780 is an apocalyptic number.

64535637780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64535637780 is an abundant number, since it is smaller than the sum of its proper divisors (137972759220).

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

64535637780 is a wasteful number, since it uses less digits than its factorization.

64535637780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12363193 (or 12363188 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 54.

The spelling of 64535637780 in words is "sixty-four billion, five hundred thirty-five million, six hundred thirty-seven thousand, seven hundred eighty".