1722227661 has 48 divisors (see below), whose sum is σ = 3201589248. Its totient is φ = 865792800.

The previous prime is 1722227657. The next prime is 1722227681. The reversal of 1722227661 is 1667222271.

It is a happy number.

It is not a de Polignac number, because 1722227661 - 2² = 1722227657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722227651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18601 + ... + 61566.

It is an arithmetic number, because the mean of its divisors is an integer number (66699776).

Almost surely, 2^1722227661 is an apocalyptic number.

1722227661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1722227661 is a deficient number, since it is larger than the sum of its proper divisors (1479361587).

1722227661 is a wasteful number, since it uses less digits than its factorization.

1722227661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80222 (or 80219 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 1722227661 is about 41499.7308545489. The cubic root of 1722227661 is about 1198.6623198138.

The spelling of 1722227661 in words is "one billion, seven hundred twenty-two million, two hundred twenty-seven thousand, six hundred sixty-one".