157823120155 has 4 divisors (see below), whose sum is σ = 189387744192. Its totient is φ = 126258496120.

The previous prime is 157823120149. The next prime is 157823120159. The reversal of 157823120155 is 551021328751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551021328751 = 1249 ⋅441169999.

It is not a de Polignac number, because 157823120155 - 2¹⁷ = 157822989083 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157823120159) 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, 15782312011 + ... + 15782312020.

It is an arithmetic number, because the mean of its divisors is an integer number (47346936048).

Almost surely, 2^157823120155 is an apocalyptic number.

157823120155 is a deficient number, since it is larger than the sum of its proper divisors (31564624037).

157823120155 is an equidigital number, since it uses as much as digits as its factorization.

157823120155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31564624036.

The product of its (nonzero) digits is 84000, while the sum is 40.

The spelling of 157823120155 in words is "one hundred fifty-seven billion, eight hundred twenty-three million, one hundred twenty thousand, one hundred fifty-five".