20161906475 has 12 divisors (see below), whose sum is σ = 25281674280. Its totient is φ = 15948292800.

The previous prime is 20161906363. The next prime is 20161906481. The reversal of 20161906475 is 57460916102.

It is not a de Polignac number, because 20161906475 - 2¹² = 20161902379 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4528541 + ... + 4532990.

It is an arithmetic number, because the mean of its divisors is an integer number (2106806190).

Almost surely, 2^20161906475 is an apocalyptic number.

20161906475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20161906475 is a deficient number, since it is larger than the sum of its proper divisors (5119767805).

20161906475 is an equidigital number, since it uses as much as digits as its factorization.

20161906475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9061630 (or 9061625 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 20161906475 in words is "twenty billion, one hundred sixty-one million, nine hundred six thousand, four hundred seventy-five".