2027545318561 has 9 divisors (see below), whose sum is σ = 2358584720499. Its totient is φ = 1737887443824.

The previous prime is 2027545318549. The next prime is 2027545318571. The reversal of 2027545318561 is 1658135457202.

The square root of 2027545318561 is 1423919.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2026907453025 + 637865536 = 1423695^2 + 25256^2 .

It is not a de Polignac number, because 2027545318561 - 2¹⁵ = 2027545285793 is a prime.

It is a super-2 number, since 2×2027545318561² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (2027545318501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9865725 + ... + 10069141.

Almost surely, 2^{2027545318561} is an apocalyptic number.

2027545318561 is the 1423919-th square number.

2027545318561 is the 711960-th centered octagonal number.

It is an amenable number.

2027545318561 is a deficient number, since it is larger than the sum of its proper divisors (331039401938).

2027545318561 is an frugal number, since it uses more digits than its factorization.

2027545318561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406848 (or 203424 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 49.

Multiplying 2027545318561 by its sum of digits (49), we get a square (99349720609489 = 9967433²).

2027545318561 divided by its sum of digits (49) gives a square (41378475889 = 203417²).

The spelling of 2027545318561 in words is "two trillion, twenty-seven billion, five hundred forty-five million, three hundred eighteen thousand, five hundred sixty-one".