158187781851 has 32 divisors (see below), whose sum is σ = 242579854080. Its totient is φ = 90683596800.

The previous prime is 158187781783. The next prime is 158187781853.

158187781851 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 158187781851 - 2⁷ = 158187781723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158187781853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205111 + ... + 598703.

It is an arithmetic number, because the mean of its divisors is an integer number (7580620440).

Almost surely, 2^158187781851 is an apocalyptic number.

158187781851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

158187781851 is a deficient number, since it is larger than the sum of its proper divisors (84392072229).

158187781851 is a wasteful number, since it uses less digits than its factorization.

158187781851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394267.

The product of its digits is 5017600, while the sum is 60.

The spelling of 158187781851 in words is "one hundred fifty-eight billion, one hundred eighty-seven million, seven hundred eighty-one thousand, eight hundred fifty-one".