20161551475 has 12 divisors (see below), whose sum is σ = 26923426096. Its totient is φ = 14888530080.

The previous prime is 20161551461. The next prime is 20161551517. The reversal of 20161551475 is 57415516102.

It is not a de Polignac number, because 20161551475 - 2²¹ = 20159454323 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

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, 31017447 + ... + 31018096.

Almost surely, 2^20161551475 is an apocalyptic number.

20161551475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20161551475 is a deficient number, since it is larger than the sum of its proper divisors (6761874621).

20161551475 is a wasteful number, since it uses less digits than its factorization.

20161551475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62035566 (or 62035561 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 37.

The spelling of 20161551475 in words is "twenty billion, one hundred sixty-one million, five hundred fifty-one thousand, four hundred seventy-five".