1661769908 has 12 divisors (see below), whose sum is σ = 2940773220. Its totient is φ = 821548992.

The previous prime is 1661769899. The next prime is 1661769917. The reversal of 1661769908 is 8099671661.

It is an interprime number because it is at equal distance from previous prime (1661769899) and next prime (1661769917).

It can be written as a sum of positive squares in 2 ways, for example, as 961744144 + 700025764 = 31012^2 + 26458^2 .

It is a super-2 number, since 2×1661769908² = 5522958454268656928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1661769908.

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, 2333591 + ... + 2334302.

It is an arithmetic number, because the mean of its divisors is an integer number (245064435).

Almost surely, 2^1661769908 is an apocalyptic number.

It is an amenable number.

1661769908 is a deficient number, since it is larger than the sum of its proper divisors (1279003312).

1661769908 is a wasteful number, since it uses less digits than its factorization.

1661769908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4667986 (or 4667984 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 1661769908 is about 40764.8121300712. The cubic root of 1661769908 is about 1184.4688125884.

The spelling of 1661769908 in words is "one billion, six hundred sixty-one million, seven hundred sixty-nine thousand, nine hundred eight".