1661099632 has 20 divisors (see below), whose sum is σ = 3293227960. Its totient is φ = 811234368.

The previous prime is 1661099621. The next prime is 1661099647. The reversal of 1661099632 is 2369901661.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1206507 + ... + 1207882.

It is an arithmetic number, because the mean of its divisors is an integer number (164661398).

Almost surely, 2^1661099632 is an apocalyptic number.

It is an amenable number.

1661099632 is a deficient number, since it is larger than the sum of its proper divisors (1632128328).

1661099632 is a wasteful number, since it uses less digits than its factorization.

1661099632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414440 (or 2414434 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 1661099632 is about 40756.5900438199. The cubic root of 1661099632 is about 1184.3095390771.

The spelling of 1661099632 in words is "one billion, six hundred sixty-one million, ninety-nine thousand, six hundred thirty-two".