2152782861601 has 4 divisors (see below), whose sum is σ = 2152825123204. Its totient is φ = 2152740600000.

The previous prime is 2152782861599. The next prime is 2152782861617. The reversal of 2152782861601 is 1061682872512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1067750222400 + 1085032639201 = 1033320^2 + 1041649^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152782861601 - 2¹ = 2152782861599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155782861601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21054300 + ... + 21156301.

It is an arithmetic number, because the mean of its divisors is an integer number (538206280801).

Almost surely, 2^{2152782861601} is an apocalyptic number.

It is an amenable number.

2152782861601 is a deficient number, since it is larger than the sum of its proper divisors (42261603).

2152782861601 is an equidigital number, since it uses as much as digits as its factorization.

2152782861601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42261602.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 2152782861601 in words is "two trillion, one hundred fifty-two billion, seven hundred eighty-two million, eight hundred sixty-one thousand, six hundred one".