661472093 has 4 divisors (see below), whose sum is σ = 665530368. Its totient is φ = 657413820.

The previous prime is 661472087. The next prime is 661472113. The reversal of 661472093 is 390274166.

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 a cyclic number.

It is not a de Polignac number, because 661472093 - 2¹⁸ = 661209949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661472993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028893 + ... + 2029218.

It is an arithmetic number, because the mean of its divisors is an integer number (166382592).

Almost surely, 2^661472093 is an apocalyptic number.

It is an amenable number.

661472093 is a deficient number, since it is larger than the sum of its proper divisors (4058275).

661472093 is a wasteful number, since it uses less digits than its factorization.

661472093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058274.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 661472093 is about 25719.0997704041. The cubic root of 661472093 is about 871.3056069686.

The spelling of 661472093 in words is "six hundred sixty-one million, four hundred seventy-two thousand, ninety-three".