161256250818 has 32 divisors (see below), whose sum is σ = 385912396800. Its totient is φ = 49617307728.

The previous prime is 161256250811. The next prime is 161256250819. The reversal of 161256250818 is 818052652161.

161256250818 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 5 + 625 + 0 + 8 + 18 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161256250811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114854178 + ... + 114855581.

It is an arithmetic number, because the mean of its divisors is an integer number (12059762400).

Almost surely, 2^161256250818 is an apocalyptic number.

161256250818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161256250818 is an abundant number, since it is smaller than the sum of its proper divisors (224656145982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161256250818 is a wasteful number, since it uses less digits than its factorization.

161256250818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229709783 (or 229709777 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 161256250818 in words is "one hundred sixty-one billion, two hundred fifty-six million, two hundred fifty thousand, eight hundred eighteen".