65661520132355 has 16 divisors (see below), whose sum is σ = 90050743077120. Its totient is φ = 45024713214432.

The previous prime is 65661520132349. The next prime is 65661520132357. The reversal of 65661520132355 is 55323102516656.

It is a happy number.

It is not a de Polignac number, because 65661520132355 - 2²⁰ = 65661519083779 is a prime.

It is a super-2 number, since 2×65661520132355² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65661520132357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1952189 + ... + 11624718.

It is an arithmetic number, because the mean of its divisors is an integer number (5628171442320).

Almost surely, 2^{65661520132355} is an apocalyptic number.

65661520132355 is a deficient number, since it is larger than the sum of its proper divisors (24389222944765).

65661520132355 is a wasteful number, since it uses less digits than its factorization.

65661520132355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13715098.

The product of its (nonzero) digits is 4860000, while the sum is 50.

The spelling of 65661520132355 in words is "sixty-five trillion, six hundred sixty-one billion, five hundred twenty million, one hundred thirty-two thousand, three hundred fifty-five".