26401516525 has 12 divisors (see below), whose sum is σ = 32739934644. Its totient is φ = 21119888000.

The previous prime is 26401516447. The next prime is 26401516549. The reversal of 26401516525 is 52561510462.

It can be written as a sum of positive squares in 6 ways, for example, as 4762518121 + 21638998404 = 69011^2 + 147102^2 .

It is not a de Polignac number, because 26401516525 - 2¹⁷ = 26401385453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 647235 + ... + 686815.

It is an arithmetic number, because the mean of its divisors is an integer number (2728327887).

Almost surely, 2^26401516525 is an apocalyptic number.

26401516525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

26401516525 is a deficient number, since it is larger than the sum of its proper divisors (6338418119).

26401516525 is a wasteful number, since it uses less digits than its factorization.

26401516525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66272 (or 66267 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 26401516525 in words is "twenty-six billion, four hundred one million, five hundred sixteen thousand, five hundred twenty-five".