1661622676 has 24 divisors (see below), whose sum is σ = 3377728256. Its totient is φ = 700449120.

The previous prime is 1661622673. The next prime is 1661622689. The reversal of 1661622676 is 6762261661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661622673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484716 + ... + 488131.

Almost surely, 2^1661622676 is an apocalyptic number.

It is an amenable number.

1661622676 is an abundant number, since it is smaller than the sum of its proper divisors (1716105580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661622676 is a wasteful number, since it uses less digits than its factorization.

1661622676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972919 (or 972917 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 1661622676 is about 40763.0062188745. The cubic root of 1661622676 is about 1184.4338304363.

The spelling of 1661622676 in words is "one billion, six hundred sixty-one million, six hundred twenty-two thousand, six hundred seventy-six".