2561206445 has 32 divisors (see below), whose sum is σ = 3546201600. Its totient is φ = 1739485440.

The previous prime is 2561206429. The next prime is 2561206457. The reversal of 2561206445 is 5446021652.

It is not a de Polignac number, because 2561206445 - 2⁴ = 2561206429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3446744 + ... + 3447486.

It is an arithmetic number, because the mean of its divisors is an integer number (110818800).

Almost surely, 2^2561206445 is an apocalyptic number.

It is an amenable number.

2561206445 is a deficient number, since it is larger than the sum of its proper divisors (984995155).

2561206445 is a wasteful number, since it uses less digits than its factorization.

2561206445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 2561206445 is about 50608.3633898588. The cubic root of 2561206445 is about 1368.1956185853.

The spelling of 2561206445 in words is "two billion, five hundred sixty-one million, two hundred six thousand, four hundred forty-five".