1661585770 has 16 divisors (see below), whose sum is σ = 3220920360. Its totient is φ = 613508544.

The previous prime is 1661585699. The next prime is 1661585801. The reversal of 1661585770 is 775851661.

It can be written as a sum of positive squares in 4 ways, for example, as 1427403961 + 234181809 = 37781^2 + 15303^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1661585770.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6390585 + ... + 6390844.

Almost surely, 2^1661585770 is an apocalyptic number.

1661585770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661585770 is a deficient number, since it is larger than the sum of its proper divisors (1559334590).

1661585770 is a wasteful number, since it uses less digits than its factorization.

1661585770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12781449.

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 1661585770 is about 40762.5535264905. The cubic root of 1661585770 is about 1184.4250612897.

The spelling of 1661585770 in words is "one billion, six hundred sixty-one million, five hundred eighty-five thousand, seven hundred seventy".