161251507156 has 12 divisors (see below), whose sum is σ = 282204158292. Its totient is φ = 80621747648.

The previous prime is 161251507121. The next prime is 161251507159. The reversal of 161251507156 is 651705152161.

161251507156 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 159627417156 + 1624090000 = 399534^2 + 40300^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161251507159) 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, 909985 + ... + 1072648.

It is an arithmetic number, because the mean of its divisors is an integer number (23517013191).

Almost surely, 2^161251507156 is an apocalyptic number.

It is an amenable number.

161251507156 is a deficient number, since it is larger than the sum of its proper divisors (120952651136).

161251507156 is a wasteful number, since it uses less digits than its factorization.

161251507156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002970 (or 2002968 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 161251507156 in words is "one hundred sixty-one billion, two hundred fifty-one million, five hundred seven thousand, one hundred fifty-six".