20645251500479 has 2 divisors, whose sum is σ = 20645251500480. Its totient is φ = 20645251500478.

The previous prime is 20645251500473. The next prime is 20645251500529. The reversal of 20645251500479 is 97400515254602.

It is an a-pointer prime, because the next prime (20645251500529) can be obtained adding 20645251500479 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20645251500479 - 2¹² = 20645251496383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20645251500473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322625750239 + 10322625750240.

It is an arithmetic number, because the mean of its divisors is an integer number (10322625750240).

Almost surely, 2^{20645251500479} is an apocalyptic number.

20645251500479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645251500479 is an equidigital number, since it uses as much as digits as its factorization.

20645251500479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 20645251500479 in words is "twenty trillion, six hundred forty-five billion, two hundred fifty-one million, five hundred thousand, four hundred seventy-nine".