155731161509 has 8 divisors (see below), whose sum is σ = 194158331328. Its totient is φ = 121348956960.

The previous prime is 155731161437. The next prime is 155731161557. The reversal of 155731161509 is 905161137551.

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

It is not a de Polignac number, because 155731161509 - 2⁸ = 155731161253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155731161509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155731161109) 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, 1011241232 + ... + 1011241385.

It is an arithmetic number, because the mean of its divisors is an integer number (24269791416).

Almost surely, 2^155731161509 is an apocalyptic number.

It is an amenable number.

155731161509 is a deficient number, since it is larger than the sum of its proper divisors (38427169819).

155731161509 is a wasteful number, since it uses less digits than its factorization.

155731161509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022482635.

The product of its (nonzero) digits is 141750, while the sum is 44.

The spelling of 155731161509 in words is "one hundred fifty-five billion, seven hundred thirty-one million, one hundred sixty-one thousand, five hundred nine".