665203953954 has 32 divisors (see below), whose sum is σ = 1385609486976. Its totient is φ = 212703200640.

The previous prime is 665203953929. The next prime is 665203953971. The reversal of 665203953954 is 459359302566.

It is a junction number, because it is equal to n+sod(n) for n = 665203953894 and 665203953903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21085747 + ... + 21117270.

It is an arithmetic number, because the mean of its divisors is an integer number (43300296468).

Almost surely, 2^665203953954 is an apocalyptic number.

665203953954 is an abundant number, since it is smaller than the sum of its proper divisors (720405533022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665203953954 is a wasteful number, since it uses less digits than its factorization.

665203953954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42203130.

The product of its (nonzero) digits is 26244000, while the sum is 57.

The spelling of 665203953954 in words is "six hundred sixty-five billion, two hundred three million, nine hundred fifty-three thousand, nine hundred fifty-four".