661375733 has 4 divisors (see below), whose sum is σ = 676756608. Its totient is φ = 645994860.

The previous prime is 661375727. The next prime is 661375739. The reversal of 661375733 is 337573166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (661375727) and next prime (661375739).

It is a cyclic number.

It is not a de Polignac number, because 661375733 - 2⁴ = 661375717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661375739) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7690373 + ... + 7690458.

It is an arithmetic number, because the mean of its divisors is an integer number (169189152).

Almost surely, 2^661375733 is an apocalyptic number.

It is an amenable number.

661375733 is a deficient number, since it is larger than the sum of its proper divisors (15380875).

661375733 is a wasteful number, since it uses less digits than its factorization.

661375733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15380874.

The product of its digits is 238140, while the sum is 41.

The square root of 661375733 is about 25717.2263862182. The cubic root of 661375733 is about 871.2632957426.

The spelling of 661375733 in words is "six hundred sixty-one million, three hundred seventy-five thousand, seven hundred thirty-three".