1661719706 has 32 divisors (see below), whose sum is σ = 2698408080. Its totient is φ = 764548096.

The previous prime is 1661719699. The next prime is 1661719711. The reversal of 1661719706 is 6079171661.

It can be written as a sum of positive squares in 8 ways, for example, as 1146838225 + 514881481 = 33865^2 + 22691^2 .

It is a super-2 number, since 2×1661719706² = 5522624762617452872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 569780 + ... + 572688.

Almost surely, 2^1661719706 is an apocalyptic number.

1661719706 is a deficient number, since it is larger than the sum of its proper divisors (1036688374).

1661719706 is a wasteful number, since it uses less digits than its factorization.

1661719706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 1661719706 is about 40764.1963737788. The cubic root of 1661719706 is about 1184.4568848837.

The spelling of 1661719706 in words is "one billion, six hundred sixty-one million, seven hundred nineteen thousand, seven hundred six".