420861561102 has 40 divisors (see below), whose sum is σ = 949048338216. Its totient is φ = 139393629648.

The previous prime is 420861561097. The next prime is 420861561103. The reversal of 420861561102 is 201165168024.

It is a happy number.

420861561102 is a `hidden beast` number, since 4 + 2 + 0 + 86 + 1 + 561 + 10 + 2 = 666.

It is a super-2 number, since 2×420861561102² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420861561103) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8248168 + ... + 8299035.

Almost surely, 2^420861561102 is an apocalyptic number.

420861561102 is an abundant number, since it is smaller than the sum of its proper divisors (528186777114).

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

420861561102 is a wasteful number, since it uses less digits than its factorization.

420861561102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16547374 (or 16547365 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 420861561102 in words is "four hundred twenty billion, eight hundred sixty-one million, five hundred sixty-one thousand, one hundred two".