2201501661 has 8 divisors (see below), whose sum is σ = 2975545920. Its totient is φ = 1447562592.

The previous prime is 2201501593. The next prime is 2201501663. The reversal of 2201501661 is 1661051022.

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

It is not a de Polignac number, because 2201501661 - 2¹⁸ = 2201239517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201501663) 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, 5026041 + ... + 5026478.

It is an arithmetic number, because the mean of its divisors is an integer number (371943240).

Almost surely, 2^2201501661 is an apocalyptic number.

It is an amenable number.

2201501661 is a deficient number, since it is larger than the sum of its proper divisors (774044259).

2201501661 is a wasteful number, since it uses less digits than its factorization.

2201501661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052595.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 2201501661 is about 46920.1626275954. The cubic root of 2201501661 is about 1300.8872958294.

Adding to 2201501661 its reverse (1661051022), we get a palindrome (3862552683).

The spelling of 2201501661 in words is "two billion, two hundred one million, five hundred one thousand, six hundred sixty-one".