12920542787 has 2 divisors, whose sum is σ = 12920542788. Its totient is φ = 12920542786.

The previous prime is 12920542781. The next prime is 12920542837. The reversal of 12920542787 is 78724502921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12920542787 - 2¹⁰ = 12920541763 is a prime.

It is not a weakly prime, because it can be changed into another prime (12920542781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460271393 + 6460271394.

It is an arithmetic number, because the mean of its divisors is an integer number (6460271394).

Almost surely, 2^12920542787 is an apocalyptic number.

12920542787 is a deficient number, since it is larger than the sum of its proper divisors (1).

12920542787 is an equidigital number, since it uses as much as digits as its factorization.

12920542787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 12920542787 in words is "twelve billion, nine hundred twenty million, five hundred forty-two thousand, seven hundred eighty-seven".