6161011661 has 4 divisors (see below), whose sum is σ = 7041156192. Its totient is φ = 5280867132.

The previous prime is 6161011643. The next prime is 6161011711. The reversal of 6161011661 is 1661101616.

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 a de Polignac number, because none of the positive numbers 2^k-6161011661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6161011621) 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, 440072255 + ... + 440072268.

It is an arithmetic number, because the mean of its divisors is an integer number (1760289048).

Almost surely, 2^6161011661 is an apocalyptic number.

It is an amenable number.

6161011661 is a deficient number, since it is larger than the sum of its proper divisors (880144531).

6161011661 is an equidigital number, since it uses as much as digits as its factorization.

6161011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880144530.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 6161011661 is about 78492.1120941461. The cubic root of 6161011661 is about 1833.2316375068.

The spelling of 6161011661 in words is "six billion, one hundred sixty-one million, eleven thousand, six hundred sixty-one".