1661075107 has 6 divisors (see below), whose sum is σ = 1702579004. Its totient is φ = 1620559440.

The previous prime is 1661075029. The next prime is 1661075113. The reversal of 1661075107 is 7015701661.

It is not a de Polignac number, because 1661075107 - 2⁷ = 1661074979 is a prime.

It is a super-2 number, since 2×1661075107² = 5518341022190122898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661075167) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 492393 + ... + 495754.

Almost surely, 2^1661075107 is an apocalyptic number.

1661075107 is a deficient number, since it is larger than the sum of its proper divisors (41503897).

1661075107 is an frugal number, since it uses more digits than its factorization.

1661075107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988229 (or 988188 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 1661075107 is about 40756.2891711206. The cubic root of 1661075107 is about 1184.3037105416.

Adding to 1661075107 its reverse (7015701661), we get a palindrome (8676776768).

The spelling of 1661075107 in words is "one billion, six hundred sixty-one million, seventy-five thousand, one hundred seven".