2545643061 has 12 divisors (see below), whose sum is σ = 3959889388. Its totient is φ = 1566549504.

The previous prime is 2545643057. The next prime is 2545643141. The reversal of 2545643061 is 1603465452.

2545643061 is a `hidden beast` number, since 2 + 5 + 4 + 5 + 643 + 0 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1122920100 + 1422722961 = 33510^2 + 37719^2 .

It is not a de Polignac number, because 2545643061 - 2² = 2545643057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545643021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10878700 + ... + 10878933.

Almost surely, 2^2545643061 is an apocalyptic number.

It is an amenable number.

2545643061 is a deficient number, since it is larger than the sum of its proper divisors (1414246327).

2545643061 is a wasteful number, since it uses less digits than its factorization.

2545643061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21757652 (or 21757649 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 2545643061 is about 50454.3661242513. The cubic root of 2545643061 is about 1365.4186680161.

The spelling of 2545643061 in words is "two billion, five hundred forty-five million, six hundred forty-three thousand, sixty-one".