1001660647 has 4 divisors (see below), whose sum is σ = 1078711480. Its totient is φ = 924609816.

The previous prime is 1001660617. The next prime is 1001660651. The reversal of 1001660647 is 7460661001.

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

It is not a de Polignac number, because 1001660647 - 2¹⁹ = 1001136359 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 (1001660617) 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, 38525397 + ... + 38525422.

It is an arithmetic number, because the mean of its divisors is an integer number (269677870).

Almost surely, 2^1001660647 is an apocalyptic number.

1001660647 is a deficient number, since it is larger than the sum of its proper divisors (77050833).

1001660647 is an equidigital number, since it uses as much as digits as its factorization.

1001660647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77050832.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1001660647 is about 31649.0228443154. The cubic root of 1001660647 is about 1000.5532428659.

The spelling of 1001660647 in words is "one billion, one million, six hundred sixty thousand, six hundred forty-seven".