6451556605 has 16 divisors (see below), whose sum is σ = 8364230784. Its totient is φ = 4748892480.

The previous prime is 6451556597. The next prime is 6451556641. The reversal of 6451556605 is 5066551546.

It is not a de Polignac number, because 6451556605 - 2³ = 6451556597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139359 + ... + 179788.

It is an arithmetic number, because the mean of its divisors is an integer number (522764424).

Almost surely, 2^6451556605 is an apocalyptic number.

6451556605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6451556605 is a deficient number, since it is larger than the sum of its proper divisors (1912674179).

6451556605 is a wasteful number, since it uses less digits than its factorization.

6451556605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319476.

The product of its (nonzero) digits is 540000, while the sum is 43.

The square root of 6451556605 is about 80321.5824358559. The cubic root of 6451556605 is about 1861.6077174538.

The spelling of 6451556605 in words is "six billion, four hundred fifty-one million, five hundred fifty-six thousand, six hundred five".