20163400551 has 48 divisors (see below), whose sum is σ = 34583797248. Its totient is φ = 11500120800.

The previous prime is 20163400519. The next prime is 20163400553. The reversal of 20163400551 is 15500436102.

20163400551 is a `hidden beast` number, since 20 + 1 + 634 + 0 + 0 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 20163400551 - 2⁵ = 20163400519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20163400553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 909286 + ... + 931196.

It is an arithmetic number, because the mean of its divisors is an integer number (720495776).

Almost surely, 2^20163400551 is an apocalyptic number.

20163400551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20163400551 is a deficient number, since it is larger than the sum of its proper divisors (14420396697).

20163400551 is an equidigital number, since it uses as much as digits as its factorization.

20163400551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22474 (or 22462 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 20163400551 its reverse (15500436102), we get a palindrome (35663836653).

The spelling of 20163400551 in words is "twenty billion, one hundred sixty-three million, four hundred thousand, five hundred fifty-one".