21874563166751 has 2 divisors, whose sum is σ = 21874563166752. Its totient is φ = 21874563166750.

The previous prime is 21874563166747. The next prime is 21874563166823. The reversal of 21874563166751 is 15766136547812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21874563166751 - 2² = 21874563166747 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21874563166721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10937281583375 + 10937281583376.

It is an arithmetic number, because the mean of its divisors is an integer number (10937281583376).

Almost surely, 2^{21874563166751} is an apocalyptic number.

21874563166751 is a deficient number, since it is larger than the sum of its proper divisors (1).

21874563166751 is an equidigital number, since it uses as much as digits as its factorization.

21874563166751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50803200, while the sum is 62.

The spelling of 21874563166751 in words is "twenty-one trillion, eight hundred seventy-four billion, five hundred sixty-three million, one hundred sixty-six thousand, seven hundred fifty-one".