2215020661 has 16 divisors (see below), whose sum is σ = 2698133760. Its totient is φ = 1775059200.

The previous prime is 2215020641. The next prime is 2215020671. The reversal of 2215020661 is 1660205122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2215020661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215020611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43666 + ... + 79603.

It is an arithmetic number, because the mean of its divisors is an integer number (168633360).

Almost surely, 2^2215020661 is an apocalyptic number.

It is an amenable number.

2215020661 is a deficient number, since it is larger than the sum of its proper divisors (483113099).

2215020661 is a wasteful number, since it uses less digits than its factorization.

2215020661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123444.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2215020661 is about 47064.0060024643. The cubic root of 2215020661 is about 1303.5446969317.

Adding to 2215020661 its reverse (1660205122), we get a palindrome (3875225783).

The spelling of 2215020661 in words is "two billion, two hundred fifteen million, twenty thousand, six hundred sixty-one".