8102187661 has 4 divisors (see below), whose sum is σ = 8102525824. Its totient is φ = 8101849500.

The previous prime is 8102187629. The next prime is 8102187703. The reversal of 8102187661 is 1667812018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8102187661 - 2⁵ = 8102187629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8102127661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130155 + ... + 182056.

It is an arithmetic number, because the mean of its divisors is an integer number (2025631456).

Almost surely, 2^8102187661 is an apocalyptic number.

It is an amenable number.

8102187661 is a deficient number, since it is larger than the sum of its proper divisors (338163).

8102187661 is a wasteful number, since it uses less digits than its factorization.

8102187661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338162.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 8102187661 is about 90012.1528517122. The cubic root of 8102187661 is about 2008.4796354975.

Adding to 8102187661 its reverse (1667812018), we get a palindrome (9769999679).

The spelling of 8102187661 in words is "eight billion, one hundred two million, one hundred eighty-seven thousand, six hundred sixty-one".