25603551061661 has 8 divisors (see below), whose sum is σ = 26184356025600. Its totient is φ = 25029163832400.

The previous prime is 25603551061633. The next prime is 25603551061667. The reversal of 25603551061661 is 16616015530652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25603551061661 - 2²² = 25603546867357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25603551061667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1604425601 + ... + 1604441558.

It is an arithmetic number, because the mean of its divisors is an integer number (3273044503200).

Almost surely, 2^{25603551061661} is an apocalyptic number.

It is an amenable number.

25603551061661 is a deficient number, since it is larger than the sum of its proper divisors (580804963939).

25603551061661 is a wasteful number, since it uses less digits than its factorization.

25603551061661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208867339.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 25603551061661 in words is "twenty-five trillion, six hundred three billion, five hundred fifty-one million, sixty-one thousand, six hundred sixty-one".