2559736978 has 4 divisors (see below), whose sum is σ = 3839605470. Its totient is φ = 1279868488.

The previous prime is 2559736951. The next prime is 2559737009. The reversal of 2559736978 is 8796379552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1999610089 + 560126889 = 44717^2 + 23667^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639934243 + ... + 639934246.

Almost surely, 2^2559736978 is an apocalyptic number.

2559736978 is a deficient number, since it is larger than the sum of its proper divisors (1279868492).

2559736978 is a wasteful number, since it uses less digits than its factorization.

2559736978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279868491.

The product of its digits is 28576800, while the sum is 61.

The square root of 2559736978 is about 50593.8432815693. The cubic root of 2559736978 is about 1367.9339056020.

The spelling of 2559736978 in words is "two billion, five hundred fifty-nine million, seven hundred thirty-six thousand, nine hundred seventy-eight".