2147760661 has 4 divisors (see below), whose sum is σ = 2159626924. Its totient is φ = 2135894400.

The previous prime is 2147760653. The next prime is 2147760679. The reversal of 2147760661 is 1660677412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1087020900 + 1060739761 = 32970^2 + 32569^2 .

It is a cyclic number.

It is not a de Polignac number, because 2147760661 - 2³ = 2147760653 is a prime.

It is a super-2 number, since 2×2147760661² = 9225751713878313842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2147760611) 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, 5932860 + ... + 5933221.

It is an arithmetic number, because the mean of its divisors is an integer number (539906731).

Almost surely, 2^2147760661 is an apocalyptic number.

It is an amenable number.

2147760661 is a deficient number, since it is larger than the sum of its proper divisors (11866263).

2147760661 is a wasteful number, since it uses less digits than its factorization.

2147760661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11866262.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 2147760661 is about 46343.9387730478. The cubic root of 2147760661 is about 1290.2146270696.

The spelling of 2147760661 in words is "two billion, one hundred forty-seven million, seven hundred sixty thousand, six hundred sixty-one".