1660635361 has 64 divisors (see below), whose sum is σ = 2269403136. Its totient is φ = 1175731200.

The previous prime is 1660635343. The next prime is 1660635377. The reversal of 1660635361 is 1635360661.

It is not a de Polignac number, because 1660635361 - 2⁵ = 1660635329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1660635361.

It is not an unprimeable number, because it can be changed into a prime (1660635331) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9174691 + ... + 9174871.

It is an arithmetic number, because the mean of its divisors is an integer number (35459424).

Almost surely, 2^1660635361 is an apocalyptic number.

1660635361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1660635361 is a deficient number, since it is larger than the sum of its proper divisors (608767775).

1660635361 is a wasteful number, since it uses less digits than its factorization.

1660635361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 1660635361 is about 40750.8939901936. The cubic root of 1660635361 is about 1184.1991921323.

The spelling of 1660635361 in words is "one billion, six hundred sixty million, six hundred thirty-five thousand, three hundred sixty-one".