1661022506 has 16 divisors (see below), whose sum is σ = 2927117088. Its totient is φ = 696932400.

The previous prime is 1661022481. The next prime is 1661022511. The reversal of 1661022506 is 6052201661.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2903600 + ... + 2904171.

It is an arithmetic number, because the mean of its divisors is an integer number (182944818).

Almost surely, 2^1661022506 is an apocalyptic number.

1661022506 is a deficient number, since it is larger than the sum of its proper divisors (1266094582).

1661022506 is a wasteful number, since it uses less digits than its factorization.

1661022506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5807797.

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

The square root of 1661022506 is about 40755.6438545633. The cubic root of 1661022506 is about 1184.2912093576.

The spelling of 1661022506 in words is "one billion, six hundred sixty-one million, twenty-two thousand, five hundred six".