2661936761 has 4 divisors (see below), whose sum is σ = 2903931024. Its totient is φ = 2419942500.

The previous prime is 2661936743. The next prime is 2661936779. The reversal of 2661936761 is 1676391662.

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 an interprime number because it is at equal distance from previous prime (2661936743) and next prime (2661936779).

It is a cyclic number.

It is not a de Polignac number, because 2661936761 - 2¹⁴ = 2661920377 is a prime.

It is a super-2 number, since 2×2661936761² = 14171814639126342242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2661936731) 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, 120997115 + ... + 120997136.

It is an arithmetic number, because the mean of its divisors is an integer number (725982756).

Almost surely, 2^2661936761 is an apocalyptic number.

It is an amenable number.

2661936761 is a deficient number, since it is larger than the sum of its proper divisors (241994263).

2661936761 is a wasteful number, since it uses less digits than its factorization.

2661936761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241994262.

The product of its digits is 489888, while the sum is 47.

The square root of 2661936761 is about 51593.9605089588. The cubic root of 2661936761 is about 1385.9021801215.

The spelling of 2661936761 in words is "two billion, six hundred sixty-one million, nine hundred thirty-six thousand, seven hundred sixty-one".