25147933561 has 3 divisors (see below), whose sum is σ = 25148092143. Its totient is φ = 25147774980.

The previous prime is 25147933543. The next prime is 25147933609. The reversal of 25147933561 is 16533974152.

The square root of 25147933561 is 158581.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 15047683561 + 10100250000 = 122669^2 + 100500^2 .

It is not a de Polignac number, because 25147933561 - 2¹⁷ = 25147802489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25147933501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 79291 + ... + 237871.

It is an arithmetic number, because the mean of its divisors is an integer number (8382697381).

Almost surely, 2^25147933561 is an apocalyptic number.

25147933561 is the 158581-st square number.

25147933561 is the 79291-st centered octagonal number.

It is an amenable number.

25147933561 is a deficient number, since it is larger than the sum of its proper divisors (158582).

25147933561 is an frugal number, since it uses more digits than its factorization.

25147933561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317162 (or 158581 counting only the distinct ones).

The product of its digits is 680400, while the sum is 46.

The spelling of 25147933561 in words is "twenty-five billion, one hundred forty-seven million, nine hundred thirty-three thousand, five hundred sixty-one".