25650716133521 has 4 divisors (see below), whose sum is σ = 27159581788452. Its totient is φ = 24141850478592.

The previous prime is 25650716133509. The next prime is 25650716133547. The reversal of 25650716133521 is 12533161705652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21839162751121 + 3811553382400 = 4673239^2 + 1952320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25650716133521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25650716153521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754432827440 + ... + 754432827473.

It is an arithmetic number, because the mean of its divisors is an integer number (6789895447113).

Almost surely, 2^{25650716133521} is an apocalyptic number.

It is an amenable number.

25650716133521 is a deficient number, since it is larger than the sum of its proper divisors (1508865654931).

25650716133521 is a wasteful number, since it uses less digits than its factorization.

25650716133521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508865654930.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 25650716133521 in words is "twenty-five trillion, six hundred fifty billion, seven hundred sixteen million, one hundred thirty-three thousand, five hundred twenty-one".