2145616551 has 48 divisors (see below), whose sum is σ = 3431544480. Its totient is φ = 1283466240.

The previous prime is 2145616519. The next prime is 2145616567. The reversal of 2145616551 is 1556165412.

2145616551 is a `hidden beast` number, since 2 + 1 + 45 + 61 + 6 + 551 = 666.

It is not a de Polignac number, because 2145616551 - 2⁵ = 2145616519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145616351) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1663915 + ... + 1665203.

It is an arithmetic number, because the mean of its divisors is an integer number (71490510).

Almost surely, 2^2145616551 is an apocalyptic number.

2145616551 is a deficient number, since it is larger than the sum of its proper divisors (1285927929).

2145616551 is a wasteful number, since it uses less digits than its factorization.

2145616551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696 (or 1693 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 2145616551 is about 46320.8004140688. The cubic root of 2145616551 is about 1289.7851435927.

The spelling of 2145616551 in words is "two billion, one hundred forty-five million, six hundred sixteen thousand, five hundred fifty-one".