2561038785 has 24 divisors (see below), whose sum is σ = 4672774080. Its totient is φ = 1293998112.

The previous prime is 2561038771. The next prime is 2561038841. The reversal of 2561038785 is 5878301652.

2561038785 is a `hidden beast` number, since 2 + 561 + 0 + 3 + 8 + 7 + 85 = 666.

It is not a de Polignac number, because 2561038785 - 2⁴ = 2561038769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2561038785.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1496829 + ... + 1498538.

It is an arithmetic number, because the mean of its divisors is an integer number (194698920).

Almost surely, 2^2561038785 is an apocalyptic number.

It is an amenable number.

2561038785 is a deficient number, since it is larger than the sum of its proper divisors (2111735295).

2561038785 is a wasteful number, since it uses less digits than its factorization.

2561038785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995397 (or 2995394 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 2561038785 is about 50606.7069171666. The cubic root of 2561038785 is about 1368.1657632954.

The spelling of 2561038785 in words is "two billion, five hundred sixty-one million, thirty-eight thousand, seven hundred eighty-five".