2145515360261 has 32 divisors (see below), whose sum is σ = 2671679324160. Its totient is φ = 1677668895936.

The previous prime is 2145515360221. The next prime is 2145515360269. The reversal of 2145515360261 is 1620635155412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145515360261 is a prime.

It is a super-2 number, since 2×2145515360261² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145515360269) 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 31 ways as a sum of consecutive naturals, for example, 3816860 + ... + 4342746.

It is an arithmetic number, because the mean of its divisors is an integer number (83489978880).

Almost surely, 2^{2145515360261} is an apocalyptic number.

It is an amenable number.

2145515360261 is a deficient number, since it is larger than the sum of its proper divisors (526163963899).

2145515360261 is a wasteful number, since it uses less digits than its factorization.

2145515360261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526433.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 2145515360261 in words is "two trillion, one hundred forty-five billion, five hundred fifteen million, three hundred sixty thousand, two hundred sixty-one".