25604532778 has 16 divisors (see below), whose sum is σ = 42007735296. Its totient is φ = 11608032640.

The previous prime is 25604532761. The next prime is 25604532803. The reversal of 25604532778 is 87723540652.

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, 1510951 + ... + 1527802.

It is an arithmetic number, because the mean of its divisors is an integer number (2625483456).

Almost surely, 2^25604532778 is an apocalyptic number.

25604532778 is a deficient number, since it is larger than the sum of its proper divisors (16403202518).

25604532778 is a wasteful number, since it uses less digits than its factorization.

25604532778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039149.

The product of its (nonzero) digits is 2822400, while the sum is 49.

The spelling of 25604532778 in words is "twenty-five billion, six hundred four million, five hundred thirty-two thousand, seven hundred seventy-eight".