661152361 has 4 divisors (see below), whose sum is σ = 661924692. Its totient is φ = 660380032.

The previous prime is 661152307. The next prime is 661152377. The reversal of 661152361 is 163251166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 421521961 + 239630400 = 20531^2 + 15480^2 .

It is a cyclic number.

It is not a de Polignac number, because 661152361 - 2¹¹ = 661150313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661152461) 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, 384880 + ... + 386593.

It is an arithmetic number, because the mean of its divisors is an integer number (165481173).

Almost surely, 2^661152361 is an apocalyptic number.

It is an amenable number.

661152361 is a deficient number, since it is larger than the sum of its proper divisors (772331).

661152361 is an equidigital number, since it uses as much as digits as its factorization.

661152361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772330.

The product of its digits is 6480, while the sum is 31.

The square root of 661152361 is about 25712.8831716710. The cubic root of 661152361 is about 871.1651983329.

The spelling of 661152361 in words is "six hundred sixty-one million, one hundred fifty-two thousand, three hundred sixty-one".