1828991661 has 64 divisors (see below), whose sum is σ = 3074949120. Its totient is φ = 943462080.

The previous prime is 1828991651. The next prime is 1828991669. The reversal of 1828991661 is 1661998281.

It is not a de Polignac number, because 1828991661 - 2¹³ = 1828983469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1828991669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 827620 + ... + 829826.

It is an arithmetic number, because the mean of its divisors is an integer number (48046080).

Almost surely, 2^1828991661 is an apocalyptic number.

It is an amenable number.

1828991661 is a deficient number, since it is larger than the sum of its proper divisors (1245957459).

1828991661 is a wasteful number, since it uses less digits than its factorization.

1828991661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334.

The product of its digits is 373248, while the sum is 51.

The square root of 1828991661 is about 42766.7120667465. The cubic root of 1828991661 is about 1222.9365034726.

The spelling of 1828991661 in words is "one billion, eight hundred twenty-eight million, nine hundred ninety-one thousand, six hundred sixty-one".