155540159781 has 8 divisors (see below), whose sum is σ = 218301978720. Its totient is φ = 98235890352.

The previous prime is 155540159713. The next prime is 155540159813. The reversal of 155540159781 is 187951045551.

It is a happy number.

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

It is not a de Polignac number, because 155540159781 - 2¹⁰ = 155540158757 is a prime.

It is a super-2 number, since 2×155540159781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155540159381) 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, 1364387310 + ... + 1364387423.

It is an arithmetic number, because the mean of its divisors is an integer number (27287747340).

Almost surely, 2^155540159781 is an apocalyptic number.

It is an amenable number.

155540159781 is a deficient number, since it is larger than the sum of its proper divisors (62761818939).

155540159781 is a wasteful number, since it uses less digits than its factorization.

155540159781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728774755.

The product of its (nonzero) digits is 1260000, while the sum is 51.

The spelling of 155540159781 in words is "one hundred fifty-five billion, five hundred forty million, one hundred fifty-nine thousand, seven hundred eighty-one".