20168685351 has 6 divisors (see below), whose sum is σ = 29132545520. Its totient is φ = 13445790228.

The previous prime is 20168685323. The next prime is 20168685367. The reversal of 20168685351 is 15358686102.

20168685351 is a `hidden beast` number, since 20 + 16 + 86 + 8 + 535 + 1 = 666.

It is not a de Polignac number, because 20168685351 - 2⁶ = 20168685287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20168685297 and 20168685306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20168685391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1120482511 + ... + 1120482528.

Almost surely, 2^20168685351 is an apocalyptic number.

20168685351 is a deficient number, since it is larger than the sum of its proper divisors (8963860169).

20168685351 is a wasteful number, since it uses less digits than its factorization.

20168685351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240965045 (or 2240965042 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 20168685351 in words is "twenty billion, one hundred sixty-eight million, six hundred eighty-five thousand, three hundred fifty-one".