20866673951 has 2 divisors, whose sum is σ = 20866673952. Its totient is φ = 20866673950.

The previous prime is 20866673921. The next prime is 20866673983. The reversal of 20866673951 is 15937666802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20866673951 - 2⁶ = 20866673887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20866673893 and 20866673902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20866673921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10433336975 + 10433336976.

It is an arithmetic number, because the mean of its divisors is an integer number (10433336976).

Almost surely, 2^20866673951 is an apocalyptic number.

20866673951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20866673951 is an equidigital number, since it uses as much as digits as its factorization.

20866673951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 20866673951 in words is "twenty billion, eight hundred sixty-six million, six hundred seventy-three thousand, nine hundred fifty-one".