1661040650 has 24 divisors (see below), whose sum is σ = 3090739680. Its totient is φ = 664157360.

The previous prime is 1661040599. The next prime is 1661040659. The reversal of 1661040650 is 560401661.

1661040650 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1661040659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171641 + ... + 181059.

It is an arithmetic number, because the mean of its divisors is an integer number (128780820).

Almost surely, 2^1661040650 is an apocalyptic number.

1661040650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661040650 is a deficient number, since it is larger than the sum of its proper divisors (1429699030).

1661040650 is a wasteful number, since it uses less digits than its factorization.

1661040650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12958 (or 12953 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1661040650 is about 40755.8664488930. The cubic root of 1661040650 is about 1184.2955215009.

The spelling of 1661040650 in words is "one billion, six hundred sixty-one million, forty thousand, six hundred fifty".