159423778537 has 4 divisors (see below), whose sum is σ = 159468576640. Its totient is φ = 159378980436.

The previous prime is 159423778531. The next prime is 159423778543. The reversal of 159423778537 is 735877324951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 735877324951 = 3593 ⋅204808607.

It is an interprime number because it is at equal distance from previous prime (159423778531) and next prime (159423778543).

It is a cyclic number.

It is not a de Polignac number, because 159423778537 - 2²⁷ = 159289560809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159423778531) 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, 22393713 + ... + 22400830.

It is an arithmetic number, because the mean of its divisors is an integer number (39867144160).

Almost surely, 2^159423778537 is an apocalyptic number.

It is an amenable number.

159423778537 is a deficient number, since it is larger than the sum of its proper divisors (44798103).

159423778537 is an equidigital number, since it uses as much as digits as its factorization.

159423778537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44798102.

The product of its digits is 44452800, while the sum is 61.

The spelling of 159423778537 in words is "one hundred fifty-nine billion, four hundred twenty-three million, seven hundred seventy-eight thousand, five hundred thirty-seven".