7221901669 has 2 divisors, whose sum is σ = 7221901670. Its totient is φ = 7221901668.

The previous prime is 7221901657. The next prime is 7221901679. The reversal of 7221901669 is 9661091227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5262777025 + 1959124644 = 72545^2 + 44262^2 .

It is a cyclic number.

It is not a de Polignac number, because 7221901669 - 2⁷ = 7221901541 is a prime.

It is a super-2 number, since 2×7221901669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7221901679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610950834 + 3610950835.

It is an arithmetic number, because the mean of its divisors is an integer number (3610950835).

Almost surely, 2^7221901669 is an apocalyptic number.

It is an amenable number.

7221901669 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221901669 is an equidigital number, since it uses as much as digits as its factorization.

7221901669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 7221901669 is about 84981.7725691810. The cubic root of 7221901669 is about 1932.9347343900.

The spelling of 7221901669 in words is "seven billion, two hundred twenty-one million, nine hundred one thousand, six hundred sixty-nine".