155439308939 has 2 divisors, whose sum is σ = 155439308940. Its totient is φ = 155439308938.

The previous prime is 155439308909. The next prime is 155439308951. The reversal of 155439308939 is 939803934551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155439308939 - 2⁸ = 155439308683 is a prime.

It is a super-2 number, since 2×155439308939² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155439308909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77719654469 + 77719654470.

It is an arithmetic number, because the mean of its divisors is an integer number (77719654470).

Almost surely, 2^155439308939 is an apocalyptic number.

155439308939 is a deficient number, since it is larger than the sum of its proper divisors (1).

155439308939 is an equidigital number, since it uses as much as digits as its factorization.

155439308939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15746400, while the sum is 59.

The spelling of 155439308939 in words is "one hundred fifty-five billion, four hundred thirty-nine million, three hundred eight thousand, nine hundred thirty-nine".