369491561993 has 4 divisors (see below), whose sum is σ = 369509722260. Its totient is φ = 369473401728.

The previous prime is 369491561987. The next prime is 369491562001. The reversal of 369491561993 is 399165194963.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 278231985529 + 91259576464 = 527477^2 + 302092^2 .

It is a cyclic number.

It is not a de Polignac number, because 369491561993 - 2¹⁰ = 369491560969 is a prime.

It is a super-3 number, since 3×369491561993³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (369491561953) 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, 9049580 + ... + 9090317.

It is an arithmetic number, because the mean of its divisors is an integer number (92377430565).

Almost surely, 2^369491561993 is an apocalyptic number.

It is an amenable number.

369491561993 is a deficient number, since it is larger than the sum of its proper divisors (18160267).

369491561993 is a wasteful number, since it uses less digits than its factorization.

369491561993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18160266.

The product of its digits is 42515280, while the sum is 65.

The spelling of 369491561993 in words is "three hundred sixty-nine billion, four hundred ninety-one million, five hundred sixty-one thousand, nine hundred ninety-three".