6661011651 has 16 divisors (see below), whose sum is σ = 10224205824. Its totient is φ = 3778507584.

The previous prime is 6661011649. The next prime is 6661011661. The reversal of 6661011651 is 1561101666.

It is not a de Polignac number, because 6661011651 - 2¹ = 6661011649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6661011601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1154755 + ... + 1160508.

It is an arithmetic number, because the mean of its divisors is an integer number (639012864).

Almost surely, 2^6661011651 is an apocalyptic number.

6661011651 is a deficient number, since it is larger than the sum of its proper divisors (3563194173).

6661011651 is a wasteful number, since it uses less digits than its factorization.

6661011651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315410.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 6661011651 is about 81615.0209887861. The cubic root of 6661011651 is about 1881.5397498746.

The spelling of 6661011651 in words is "six billion, six hundred sixty-one million, eleven thousand, six hundred fifty-one".