1622261661 has 4 divisors (see below), whose sum is σ = 2163015552. Its totient is φ = 1081507772.

The previous prime is 1622261657. The next prime is 1622261701. The reversal of 1622261661 is 1661622261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1622261661 - 2² = 1622261657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622261621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270376941 + ... + 270376946.

It is an arithmetic number, because the mean of its divisors is an integer number (540753888).

Almost surely, 2^1622261661 is an apocalyptic number.

It is an amenable number.

1622261661 is a deficient number, since it is larger than the sum of its proper divisors (540753891).

1622261661 is an equidigital number, since it uses as much as digits as its factorization.

1622261661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540753890.

The product of its digits is 10368, while the sum is 33.

The square root of 1622261661 is about 40277.3095054772. The cubic root of 1622261661 is about 1175.0065878007.

The spelling of 1622261661 in words is "one billion, six hundred twenty-two million, two hundred sixty-one thousand, six hundred sixty-one".