2561562998 has 16 divisors (see below), whose sum is σ = 3915034560. Its totient is φ = 1256635656.

The previous prime is 2561562979. The next prime is 2561563013. The reversal of 2561562998 is 8992651652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40961 + ... + 82467.

It is an arithmetic number, because the mean of its divisors is an integer number (244689660).

Almost surely, 2^2561562998 is an apocalyptic number.

2561562998 is a deficient number, since it is larger than the sum of its proper divisors (1353471562).

2561562998 is a wasteful number, since it uses less digits than its factorization.

2561562998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42091.

The product of its digits is 2332800, while the sum is 53.

The square root of 2561562998 is about 50611.8859360131. The cubic root of 2561562998 is about 1368.2591058034.

The spelling of 2561562998 in words is "two billion, five hundred sixty-one million, five hundred sixty-two thousand, nine hundred ninety-eight".