155538504709 has 16 divisors (see below), whose sum is σ = 185558999040. Its totient is φ = 127472693040.

The previous prime is 155538504697. The next prime is 155538504739. The reversal of 155538504709 is 907405835551.

It is a happy number.

It is not a de Polignac number, because 155538504709 - 2⁷ = 155538504581 is a prime.

It is a super-2 number, since 2×155538504709² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155538504739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230722 + ... + 603580.

It is an arithmetic number, because the mean of its divisors is an integer number (11597437440).

Almost surely, 2^155538504709 is an apocalyptic number.

It is an amenable number.

155538504709 is a deficient number, since it is larger than the sum of its proper divisors (30020494331).

155538504709 is a wasteful number, since it uses less digits than its factorization.

155538504709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375480.

The product of its (nonzero) digits is 3780000, while the sum is 52.

The spelling of 155538504709 in words is "one hundred fifty-five billion, five hundred thirty-eight million, five hundred four thousand, seven hundred nine".