6661151651 has 32 divisors (see below), whose sum is σ = 8810987520. Its totient is φ = 4878468000.

The previous prime is 6661151639. The next prime is 6661151681. The reversal of 6661151651 is 1561511666.

It is not a de Polignac number, because 6661151651 - 2¹⁴ = 6661135267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661151681) 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, 167876 + ... + 203726.

It is an arithmetic number, because the mean of its divisors is an integer number (275343360).

Almost surely, 2^6661151651 is an apocalyptic number.

6661151651 is a deficient number, since it is larger than the sum of its proper divisors (2149835869).

6661151651 is a wasteful number, since it uses less digits than its factorization.

6661151651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36015.

The product of its digits is 32400, while the sum is 38.

The square root of 6661151651 is about 81615.8786695334. The cubic root of 6661151651 is about 1881.5529317421.

It can be divided in two parts, 666115 and 1651, that added together give a palindrome (667766).

The spelling of 6661151651 in words is "six billion, six hundred sixty-one million, one hundred fifty-one thousand, six hundred fifty-one".