20549155157939 has 2 divisors, whose sum is σ = 20549155157940. Its totient is φ = 20549155157938.

The previous prime is 20549155157887. The next prime is 20549155158011. The reversal of 20549155157939 is 93975155194502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20549155157939 - 2²⁴ = 20549138380723 is a prime.

It is not a weakly prime, because it can be changed into another prime (20549155156939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10274577578969 + 10274577578970.

It is an arithmetic number, because the mean of its divisors is an integer number (10274577578970).

Almost surely, 2^{20549155157939} is an apocalyptic number.

20549155157939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20549155157939 is an equidigital number, since it uses as much as digits as its factorization.

20549155157939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 76545000, while the sum is 65.

The spelling of 20549155157939 in words is "twenty trillion, five hundred forty-nine billion, one hundred fifty-five million, one hundred fifty-seven thousand, nine hundred thirty-nine".