64651851 has 72 divisors (see below), whose sum is σ = 113166144. Its totient is φ = 36566640.

The previous prime is 64651841. The next prime is 64651871. The reversal of 64651851 is 15815646.

64651851 is a `hidden beast` number, since 646 + 5 + 1 + 8 + 5 + 1 = 666.

64651851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64651851 - 2⁹ = 64651339 is a prime.

Its product of digits (28800) is a multiple of the sum of its prime divisors (100).

It is not an unprimeable number, because it can be changed into a prime (64651801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 964920 + ... + 964986.

It is an arithmetic number, because the mean of its divisors is an integer number (1571752).

Almost surely, 2^64651851 is an apocalyptic number.

64651851 is a deficient number, since it is larger than the sum of its proper divisors (48514293).

64651851 is a wasteful number, since it uses less digits than its factorization.

64651851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 100 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 64651851 is about 8040.6374747280. The cubic root of 64651851 is about 401.3534382638.

The spelling of 64651851 in words is "sixty-four million, six hundred fifty-one thousand, eight hundred fifty-one".