20401474504951 has 2 divisors, whose sum is σ = 20401474504952. Its totient is φ = 20401474504950.

The previous prime is 20401474504949. The next prime is 20401474504991. The reversal of 20401474504951 is 15940547410402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20401474504951 - 2¹ = 20401474504949 is a prime.

Together with 20401474504949, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20401474504991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200737252475 + 10200737252476.

It is an arithmetic number, because the mean of its divisors is an integer number (10200737252476).

Almost surely, 2^{20401474504951} is an apocalyptic number.

20401474504951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401474504951 is an equidigital number, since it uses as much as digits as its factorization.

20401474504951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 20401474504951 in words is "twenty trillion, four hundred one billion, four hundred seventy-four million, five hundred four thousand, nine hundred fifty-one".