25990004691 has 36 divisors (see below), whose sum is σ = 44494287552. Its totient is φ = 14571202464.

The previous prime is 25990004687. The next prime is 25990004723. The reversal of 25990004691 is 19640009952.

It is not a de Polignac number, because 25990004691 - 2² = 25990004687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25990004671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 532611 + ... + 579356.

It is an arithmetic number, because the mean of its divisors is an integer number (1235952432).

Almost surely, 2^25990004691 is an apocalyptic number.

25990004691 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25990004691 is a deficient number, since it is larger than the sum of its proper divisors (18504282861).

25990004691 is a wasteful number, since it uses less digits than its factorization.

25990004691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112040 (or 1112030 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 25990004691 in words is "twenty-five billion, nine hundred ninety million, four thousand, six hundred ninety-one".