2051551064 has 8 divisors (see below), whose sum is σ = 3846658260. Its totient is φ = 1025775528.

The previous prime is 2051551003. The next prime is 2051551069. The reversal of 2051551064 is 4601551502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051551069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128221934 + ... + 128221949.

Almost surely, 2^2051551064 is an apocalyptic number.

It is an amenable number.

2051551064 is a deficient number, since it is larger than the sum of its proper divisors (1795107196).

2051551064 is a wasteful number, since it uses less digits than its factorization.

2051551064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256443889 (or 256443885 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 2051551064 is about 45294.0510884156. The cubic root of 2051551064 is about 1270.6543972847.

The spelling of 2051551064 in words is "two billion, fifty-one million, five hundred fifty-one thousand, sixty-four".