5911729661 has 4 divisors (see below), whose sum is σ = 6008643324. Its totient is φ = 5814816000.

The previous prime is 5911729643. The next prime is 5911729669. The reversal of 5911729661 is 1669271195.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1669271195 = 5 ⋅333854239.

It can be written as a sum of positive squares in 2 ways, for example, as 1773252100 + 4138477561 = 42110^2 + 64331^2 .

It is a cyclic number.

It is not a de Polignac number, because 5911729661 - 2¹⁴ = 5911713277 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 (5911729669) 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, 48456740 + ... + 48456861.

It is an arithmetic number, because the mean of its divisors is an integer number (1502160831).

Almost surely, 2^5911729661 is an apocalyptic number.

It is an amenable number.

5911729661 is a deficient number, since it is larger than the sum of its proper divisors (96913663).

5911729661 is an equidigital number, since it uses as much as digits as its factorization.

5911729661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96913662.

The product of its digits is 204120, while the sum is 47.

The square root of 5911729661 is about 76887.7731567250. The cubic root of 5911729661 is about 1808.1655417454.

The spelling of 5911729661 in words is "five billion, nine hundred eleven million, seven hundred twenty-nine thousand, six hundred sixty-one".