155439308929 has 4 divisors (see below), whose sum is σ = 162197539776. Its totient is φ = 148681078084.

The previous prime is 155439308909. The next prime is 155439308939. The reversal of 155439308929 is 929803934551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 929803934551 = 263 ⋅3535376177.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155439308929 is a prime.

It is a super-2 number, since 2×155439308929² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155439308909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3379115389 + ... + 3379115434.

It is an arithmetic number, because the mean of its divisors is an integer number (40549384944).

Almost surely, 2^155439308929 is an apocalyptic number.

It is an amenable number.

155439308929 is a deficient number, since it is larger than the sum of its proper divisors (6758230847).

155439308929 is an equidigital number, since it uses as much as digits as its factorization.

155439308929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758230846.

The product of its (nonzero) digits is 10497600, while the sum is 58.

The spelling of 155439308929 in words is "one hundred fifty-five billion, four hundred thirty-nine million, three hundred eight thousand, nine hundred twenty-nine".