161671097850025 has 9 divisors (see below), whose sum is σ = 200472240167031. Its totient is φ = 129336827420040.

The previous prime is 161671097850023. The next prime is 161671097850047. The reversal of 161671097850025 is 520058790176161.

The square root of 161671097850025 is 12714995.

It is a perfect power (a square), and thus also a powerful number.

161671097850025 is digitally balanced in base 2, 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 only one way, i.e., 58201595226009 + 103469502624016 = 7628997^2 + 10171996^2 .

It is not a de Polignac number, because 161671097850025 - 2¹ = 161671097850023 is a prime.

It is a super-2 number, since 2×161671097850025² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161671097850023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 62303476 + ... + 64846474.

Almost surely, 2^{161671097850025} is an apocalyptic number.

161671097850025 is the 12714995-th square number.

161671097850025 is the 6357498-th centered octagonal number.

It is an amenable number.

161671097850025 is a deficient number, since it is larger than the sum of its proper divisors (38801142317006).

161671097850025 is an frugal number, since it uses more digits than its factorization.

161671097850025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5086008 (or 2543004 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 58.

The spelling of 161671097850025 in words is "one hundred sixty-one trillion, six hundred seventy-one billion, ninety-seven million, eight hundred fifty thousand, twenty-five".