20012551613 has 2 divisors, whose sum is σ = 20012551614. Its totient is φ = 20012551612.

The previous prime is 20012551583. The next prime is 20012551631. The reversal of 20012551613 is 31615521002.

Together with next prime (20012551631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19997636569 + 14915044 = 141413^2 + 3862^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012551613 - 2¹² = 20012547517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012551213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006275806 + 10006275807.

It is an arithmetic number, because the mean of its divisors is an integer number (10006275807).

Almost surely, 2^20012551613 is an apocalyptic number.

It is an amenable number.

20012551613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012551613 is an equidigital number, since it uses as much as digits as its factorization.

20012551613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 20012551613 in words is "twenty billion, twelve million, five hundred fifty-one thousand, six hundred thirteen".