6651611655 has 32 divisors (see below), whose sum is σ = 11467674624. Its totient is φ = 3272800896.

The previous prime is 6651611633. The next prime is 6651611657. The reversal of 6651611655 is 5561161566.

It is not a de Polignac number, because 6651611655 - 2¹² = 6651607559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651611657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 378882 + ... + 396048.

It is an arithmetic number, because the mean of its divisors is an integer number (358364832).

Almost surely, 2^6651611655 is an apocalyptic number.

6651611655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6651611655 is a deficient number, since it is larger than the sum of its proper divisors (4816062969).

6651611655 is a wasteful number, since it uses less digits than its factorization.

6651611655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19175.

The product of its digits is 162000, while the sum is 42.

The square root of 6651611655 is about 81557.4132436776. The cubic root of 6651611655 is about 1880.6542591378.

The spelling of 6651611655 in words is "six billion, six hundred fifty-one million, six hundred eleven thousand, six hundred fifty-five".