7215550570661 has 2 divisors, whose sum is σ = 7215550570662. Its totient is φ = 7215550570660.

The previous prime is 7215550570639. The next prime is 7215550570673. The reversal of 7215550570661 is 1660750555127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5145779201761 + 2069771368900 = 2268431^2 + 1438670^2 .

It is an emirp because it is prime and its reverse (1660750555127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7215550570661 - 2⁶ = 7215550570597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7215550570681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3607775285330 + 3607775285331.

It is an arithmetic number, because the mean of its divisors is an integer number (3607775285331).

Almost surely, 2^{7215550570661} is an apocalyptic number.

It is an amenable number.

7215550570661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7215550570661 is an equidigital number, since it uses as much as digits as its factorization.

7215550570661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2205000, while the sum is 50.

The spelling of 7215550570661 in words is "seven trillion, two hundred fifteen billion, five hundred fifty million, five hundred seventy thousand, six hundred sixty-one".