2156520245 has 8 divisors (see below), whose sum is σ = 2823081120. Its totient is φ = 1568378320.

The previous prime is 2156520211. The next prime is 2156520271. The reversal of 2156520245 is 5420256512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2156520245 - 2³⁰ = 1082778421 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19604675 + ... + 19604784.

It is an arithmetic number, because the mean of its divisors is an integer number (352885140).

Almost surely, 2^2156520245 is an apocalyptic number.

It is an amenable number.

2156520245 is a deficient number, since it is larger than the sum of its proper divisors (666560875).

2156520245 is a wasteful number, since it uses less digits than its factorization.

2156520245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39209475.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 2156520245 is about 46438.3488616897. The cubic root of 2156520245 is about 1291.9662830632.

Adding to 2156520245 its reverse (5420256512), we get a palindrome (7576776757).

The spelling of 2156520245 in words is "two billion, one hundred fifty-six million, five hundred twenty thousand, two hundred forty-five".