25616223505 has 8 divisors (see below), whose sum is σ = 31570264872. Its totient is φ = 19939114368.

The previous prime is 25616223467. The next prime is 25616223541. The reversal of 25616223505 is 50532261652.

It can be written as a sum of positive squares in 4 ways, for example, as 8684748864 + 16931474641 = 93192^2 + 130121^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25616223505 is a prime.

It is a super-2 number, since 2×25616223505² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69232852 + ... + 69233221.

It is an arithmetic number, because the mean of its divisors is an integer number (3946283109).

Almost surely, 2^25616223505 is an apocalyptic number.

It is an amenable number.

25616223505 is a deficient number, since it is larger than the sum of its proper divisors (5954041367).

25616223505 is a wasteful number, since it uses less digits than its factorization.

25616223505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138466115.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 25616223505 in words is "twenty-five billion, six hundred sixteen million, two hundred twenty-three thousand, five hundred five".