6660400945 has 8 divisors (see below), whose sum is σ = 8719070400. Its totient is φ = 4843927920.

The previous prime is 6660400939. The next prime is 6660400993. The reversal of 6660400945 is 5490040666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6660400945 - 2⁹ = 6660400433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6660400898 and 6660400907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60549045 + ... + 60549154.

It is an arithmetic number, because the mean of its divisors is an integer number (1089883800).

Almost surely, 2^6660400945 is an apocalyptic number.

It is an amenable number.

6660400945 is a deficient number, since it is larger than the sum of its proper divisors (2058669455).

6660400945 is a wasteful number, since it uses less digits than its factorization.

6660400945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121098215.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 6660400945 is about 81611.2795206643. The cubic root of 6660400945 is about 1881.4822459601.

The spelling of 6660400945 in words is "six billion, six hundred sixty million, four hundred thousand, nine hundred forty-five".