155220986309 has 2 divisors, whose sum is σ = 155220986310. Its totient is φ = 155220986308.

The previous prime is 155220986303. The next prime is 155220986363. The reversal of 155220986309 is 903689022551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155174542084 + 46444225 = 393922^2 + 6815^2 .

It is a cyclic number.

It is not a de Polignac number, because 155220986309 - 2²⁸ = 154952550853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155220986303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77610493154 + 77610493155.

It is an arithmetic number, because the mean of its divisors is an integer number (77610493155).

Almost surely, 2^155220986309 is an apocalyptic number.

It is an amenable number.

155220986309 is a deficient number, since it is larger than the sum of its proper divisors (1).

155220986309 is an equidigital number, since it uses as much as digits as its factorization.

155220986309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 155220986309 in words is "one hundred fifty-five billion, two hundred twenty million, nine hundred eighty-six thousand, three hundred nine".