661033894453 has 8 divisors (see below), whose sum is σ = 668938697856. Its totient is φ = 653172405600.

The previous prime is 661033894439. The next prime is 661033894459. The reversal of 661033894453 is 354498330166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661033894453 - 2⁵ = 661033894421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661033894453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661033894459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10797933 + ... + 10858978.

It is an arithmetic number, because the mean of its divisors is an integer number (83617337232).

Almost surely, 2^661033894453 is an apocalyptic number.

It is an amenable number.

661033894453 is a deficient number, since it is larger than the sum of its proper divisors (7904803403).

661033894453 is a wasteful number, since it uses less digits than its factorization.

661033894453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21657275.

The product of its (nonzero) digits is 5598720, while the sum is 52.

The spelling of 661033894453 in words is "six hundred sixty-one billion, thirty-three million, eight hundred ninety-four thousand, four hundred fifty-three".