169408797649 has 27 divisors (see below), whose sum is σ = 213439674843. Its totient is φ = 134008095312.

The previous prime is 169408797563. The next prime is 169408797689. The reversal of 169408797649 is 946797804961.

The square root of 169408797649 is 411593.

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

It can be written as a sum of positive squares in only one way, i.e., 25060473025 + 144348324624 = 158305^2 + 379932^2 .

It is not a de Polignac number, because 169408797649 - 2¹³ = 169408789457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169408797689) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 37452702 + ... + 37457224.

Almost surely, 2^169408797649 is an apocalyptic number.

169408797649 is the 411593-rd square number.

169408797649 is the 205797-th centered octagonal number.

It is an amenable number.

169408797649 is a deficient number, since it is larger than the sum of its proper divisors (44030877194).

169408797649 is an frugal number, since it uses more digits than its factorization.

169408797649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9086 (or 4543 counting only the distinct ones).

The product of its (nonzero) digits is 164602368, while the sum is 70.

The spelling of 169408797649 in words is "one hundred sixty-nine billion, four hundred eight million, seven hundred ninety-seven thousand, six hundred forty-nine".