10001515661 has 8 divisors (see below), whose sum is σ = 10450737024. Its totient is φ = 9553492080.

The previous prime is 10001515639. The next prime is 10001515681. The reversal of 10001515661 is 16651510001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10001515661 - 2²² = 9997321357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10001515661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001515681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282350 + ... + 315791.

It is an arithmetic number, because the mean of its divisors is an integer number (1306342128).

Almost surely, 2^10001515661 is an apocalyptic number.

It is an amenable number.

10001515661 is a deficient number, since it is larger than the sum of its proper divisors (449221363).

10001515661 is an equidigital number, since it uses as much as digits as its factorization.

10001515661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598891.

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 10001515661 in words is "ten billion, one million, five hundred fifteen thousand, six hundred sixty-one".