161101520151261 has 4 divisors (see below), whose sum is σ = 214802026868352. Its totient is φ = 107401013434172.

The previous prime is 161101520151241. The next prime is 161101520151337. The reversal of 161101520151261 is 162151025101161.

161101520151261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 161101520151261 - 2⁹ = 161101520150749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161101520151241) 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, 26850253358541 + ... + 26850253358546.

It is an arithmetic number, because the mean of its divisors is an integer number (53700506717088).

Almost surely, 2^{161101520151261} is an apocalyptic number.

It is an amenable number.

161101520151261 is a deficient number, since it is larger than the sum of its proper divisors (53700506717091).

161101520151261 is an equidigital number, since it uses as much as digits as its factorization.

161101520151261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53700506717090.

The product of its (nonzero) digits is 3600, while the sum is 33.

The spelling of 161101520151261 in words is "one hundred sixty-one trillion, one hundred one billion, five hundred twenty million, one hundred fifty-one thousand, two hundred sixty-one".