165620098978560 has 216 divisors, whose sum is σ = 573048263415264. Its totient is φ = 44163820339200.

The previous prime is 165620098978501. The next prime is 165620098978777. The reversal of 165620098978560 is 65879890026561.

165620098978560 is a `hidden beast` number, since 1 + 6 + 56 + 2 + 0 + 0 + 9 + 8 + 9 + 7 + 8 + 560 = 666.

It is a super-2 number, since 2×165620098978560² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351735285 + ... + 352205835.

Almost surely, 2^{165620098978560} is an apocalyptic number.

165620098978560 is a gapful number since it is divisible by the number (10) 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 165620098978560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286524131707632).

165620098978560 is an abundant number, since it is smaller than the sum of its proper divisors (407428164436704).

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

165620098978560 is a wasteful number, since it uses less digits than its factorization.

165620098978560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501131 (or 501114 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 72.

The spelling of 165620098978560 in words is "one hundred sixty-five trillion, six hundred twenty billion, ninety-eight million, nine hundred seventy-eight thousand, five hundred sixty".