2215665061651 has 8 divisors (see below), whose sum is σ = 2298249586160. Its totient is φ = 2134492238592.

The previous prime is 2215665061633. The next prime is 2215665061661. The reversal of 2215665061651 is 1561605665122.

It is a happy number.

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 2215665061651 - 2¹⁵ = 2215665028883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2215665061661) 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, 352922166 + ... + 352928443.

It is an arithmetic number, because the mean of its divisors is an integer number (287281198270).

Almost surely, 2^{2215665061651} is an apocalyptic number.

2215665061651 is a deficient number, since it is larger than the sum of its proper divisors (82584524509).

2215665061651 is an equidigital number, since it uses as much as digits as its factorization.

2215665061651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705850725.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 2215665061651 in words is "two trillion, two hundred fifteen billion, six hundred sixty-five million, sixty-one thousand, six hundred fifty-one".