20125057504661 has 2 divisors, whose sum is σ = 20125057504662. Its totient is φ = 20125057504660.

The previous prime is 20125057504597. The next prime is 20125057504679. The reversal of 20125057504661 is 16640575052102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19151739112900 + 973318391761 = 4376270^2 + 986569^2 .

It is a cyclic number.

It is not a de Polignac number, because 20125057504661 - 2⁶ = 20125057504597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20125057504691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062528752330 + 10062528752331.

It is an arithmetic number, because the mean of its divisors is an integer number (10062528752331).

Almost surely, 2^{20125057504661} is an apocalyptic number.

It is an amenable number.

20125057504661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125057504661 is an equidigital number, since it uses as much as digits as its factorization.

20125057504661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 20125057504661 in words is "twenty trillion, one hundred twenty-five billion, fifty-seven million, five hundred four thousand, six hundred sixty-one".