155399433943 has 8 divisors (see below), whose sum is σ = 167369162688. Its totient is φ = 143431980384.

The previous prime is 155399433919. The next prime is 155399433961. The reversal of 155399433943 is 349334993551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155399433943 - 2²¹ = 155397336791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155399433983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425596 + ... + 701377.

It is an arithmetic number, because the mean of its divisors is an integer number (20921145336).

Almost surely, 2^155399433943 is an apocalyptic number.

155399433943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

155399433943 is a deficient number, since it is larger than the sum of its proper divisors (11969728745).

155399433943 is a wasteful number, since it uses less digits than its factorization.

155399433943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137593.

The product of its digits is 23619600, while the sum is 58.

The spelling of 155399433943 in words is "one hundred fifty-five billion, three hundred ninety-nine million, four hundred thirty-three thousand, nine hundred forty-three".