25355991606 has 64 divisors (see below), whose sum is σ = 61659429120. Its totient is φ = 6851036160.

The previous prime is 25355991581. The next prime is 25355991613. The reversal of 25355991606 is 60619955352.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 573391 + ... + 616026.

It is an arithmetic number, because the mean of its divisors is an integer number (963428580).

Almost surely, 2^25355991606 is an apocalyptic number.

25355991606 is an abundant number, since it is smaller than the sum of its proper divisors (36303437514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25355991606 is a wasteful number, since it uses less digits than its factorization.

25355991606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189469.

The product of its (nonzero) digits is 2187000, while the sum is 51.

The spelling of 25355991606 in words is "twenty-five billion, three hundred fifty-five million, nine hundred ninety-one thousand, six hundred six".