2145565551 has 16 divisors (see below), whose sum is σ = 2961185760. Its totient is φ = 1380220800.

The previous prime is 2145565531. The next prime is 2145565567. The reversal of 2145565551 is 1555655412.

It is not a de Polignac number, because 2145565551 - 2⁷ = 2145565423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145565531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158901 + ... + 171873.

It is an arithmetic number, because the mean of its divisors is an integer number (185074110).

Almost surely, 2^2145565551 is an apocalyptic number.

2145565551 is a deficient number, since it is larger than the sum of its proper divisors (815620209).

2145565551 is a wasteful number, since it uses less digits than its factorization.

2145565551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14906.

The product of its digits is 150000, while the sum is 39.

The square root of 2145565551 is about 46320.2499021756. The cubic root of 2145565551 is about 1289.7749243757.

The spelling of 2145565551 in words is "two billion, one hundred forty-five million, five hundred sixty-five thousand, five hundred fifty-one".