661273053 has 8 divisors (see below), whose sum is σ = 1007654208. Its totient is φ = 377870304.

The previous prime is 661273043. The next prime is 661273057. The reversal of 661273053 is 350372166.

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

It is not a de Polignac number, because 661273053 - 2⁴ = 661273037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661273057) 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, 15744576 + ... + 15744617.

It is an arithmetic number, because the mean of its divisors is an integer number (125956776).

Almost surely, 2^661273053 is an apocalyptic number.

It is an amenable number.

661273053 is a deficient number, since it is larger than the sum of its proper divisors (346381155).

661273053 is a wasteful number, since it uses less digits than its factorization.

661273053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31489203.

The product of its (nonzero) digits is 22680, while the sum is 33.

The square root of 661273053 is about 25715.2299814721. The cubic root of 661273053 is about 871.2182049111.

The spelling of 661273053 in words is "six hundred sixty-one million, two hundred seventy-three thousand, fifty-three".