64449469161 has 135 divisors (see below), whose sum is σ = 120138539703. Its totient is φ = 33266993760.

The previous prime is 64449469153. The next prime is 64449469163. The reversal of 64449469161 is 16196494446.

The square root of 64449469161 is 253869.

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

64449469161 is a `hidden beast` number, since 6 + 4 + 4 + 494 + 6 + 91 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18891128025 + 45558341136 = 137445^2 + 213444^2 .

It is not a de Polignac number, because 64449469161 - 2³ = 64449469153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64449469098 and 64449469107.

It is not an unprimeable number, because it can be changed into a prime (64449469163) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 410506095 + ... + 410506251.

Almost surely, 2^64449469161 is an apocalyptic number.

64449469161 is the 253869-th square number.

64449469161 is the 126935-th centered octagonal number.

It is an amenable number.

64449469161 is a deficient number, since it is larger than the sum of its proper divisors (55689070542).

64449469161 is an equidigital number, since it uses as much as digits as its factorization.

64449469161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 178 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 64449469161 in words is "sixty-four billion, four hundred forty-nine million, four hundred sixty-nine thousand, one hundred sixty-one".