661395097 has 4 divisors (see below), whose sum is σ = 721521936. Its totient is φ = 601268260.

The previous prime is 661395043. The next prime is 661395101. The reversal of 661395097 is 790593166.

661395097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 661395097 - 2¹⁹ = 660870809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661395697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30063403 + ... + 30063424.

It is an arithmetic number, because the mean of its divisors is an integer number (180380484).

Almost surely, 2^661395097 is an apocalyptic number.

It is an amenable number.

661395097 is a deficient number, since it is larger than the sum of its proper divisors (60126839).

661395097 is a wasteful number, since it uses less digits than its factorization.

661395097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60126838.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 661395097 is about 25717.6028626309. The cubic root of 661395097 is about 871.2717987145.

The spelling of 661395097 in words is "six hundred sixty-one million, three hundred ninety-five thousand, ninety-seven".