21562166476055 has 16 divisors (see below), whose sum is σ = 25889561488224. Its totient is φ = 17239761576960.

The previous prime is 21562166476051. The next prime is 21562166476091. The reversal of 21562166476055 is 55067466126512.

It is not a de Polignac number, because 21562166476055 - 2² = 21562166476051 is a prime.

It is a super-2 number, since 2×21562166476055² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21562166476051) 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, 61042307 + ... + 61394523.

It is an arithmetic number, because the mean of its divisors is an integer number (1618097593014).

Almost surely, 2^{21562166476055} is an apocalyptic number.

21562166476055 is a deficient number, since it is larger than the sum of its proper divisors (4327395012169).

21562166476055 is a wasteful number, since it uses less digits than its factorization.

21562166476055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359266.

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 21562166476055 in words is "twenty-one trillion, five hundred sixty-two billion, one hundred sixty-six million, four hundred seventy-six thousand, fifty-five".