661303157 has 8 divisors (see below), whose sum is σ = 668251584. Its totient is φ = 654365088.

The previous prime is 661303127. The next prime is 661303169. The reversal of 661303157 is 751303166.

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 661303157 - 2¹² = 661299061 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 (661303127) 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 7 ways as a sum of consecutive naturals, for example, 245138 + ... + 247820.

It is an arithmetic number, because the mean of its divisors is an integer number (83531448).

Almost surely, 2^661303157 is an apocalyptic number.

It is an amenable number.

661303157 is a deficient number, since it is larger than the sum of its proper divisors (6948427).

661303157 is a wasteful number, since it uses less digits than its factorization.

661303157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5179.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 661303157 is about 25715.8153088717. The cubic root of 661303157 is about 871.2314252466.

Subtracting 661303157 from its reverse (751303166), we obtain a palindrome (90000009).

The spelling of 661303157 in words is "six hundred sixty-one million, three hundred three thousand, one hundred fifty-seven".