8511779661 has 24 divisors (see below), whose sum is σ = 14402123424. Its totient is φ = 4421702880.

The previous prime is 8511779659. The next prime is 8511779681. The reversal of 8511779661 is 1669771158.

It is not a de Polignac number, because 8511779661 - 2¹ = 8511779659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8511779681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2630350 + ... + 2633583.

It is an arithmetic number, because the mean of its divisors is an integer number (600088476).

Almost surely, 2^8511779661 is an apocalyptic number.

It is an amenable number.

8511779661 is a deficient number, since it is larger than the sum of its proper divisors (5890343763).

8511779661 is a wasteful number, since it uses less digits than its factorization.

8511779661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263961 (or 5263954 counting only the distinct ones).

The product of its digits is 635040, while the sum is 51.

The square root of 8511779661 is about 92259.3066362413. The cubic root of 8511779661 is about 2041.7698709554.

The spelling of 8511779661 in words is "eight billion, five hundred eleven million, seven hundred seventy-nine thousand, six hundred sixty-one".