1001664537 has 4 divisors (see below), whose sum is σ = 1335552720. Its totient is φ = 667776356.

The previous prime is 1001664533. The next prime is 1001664577. The reversal of 1001664537 is 7354661001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7354661001 = 3 ⋅2451553667.

It is a cyclic number.

It is not a de Polignac number, because 1001664537 - 2² = 1001664533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001664498 and 1001664507.

It is not an unprimeable number, because it can be changed into a prime (1001664533) 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, 166944087 + ... + 166944092.

It is an arithmetic number, because the mean of its divisors is an integer number (333888180).

Almost surely, 2^1001664537 is an apocalyptic number.

It is an amenable number.

1001664537 is a deficient number, since it is larger than the sum of its proper divisors (333888183).

1001664537 is an equidigital number, since it uses as much as digits as its factorization.

1001664537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333888182.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 1001664537 is about 31649.0842995496. The cubic root of 1001664537 is about 1000.5545380973.

The spelling of 1001664537 in words is "one billion, one million, six hundred sixty-four thousand, five hundred thirty-seven".