25410783709921 has 9 divisors (see below), whose sum is σ = 25736914131411. Its totient is φ = 25088735028864.

The previous prime is 25410783709891. The next prime is 25410783709979. The reversal of 25410783709921 is 12990738701452.

The square root of 25410783709921 is 5040911.

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

It can be written as a sum of positive squares in only one way, i.e., 134424156321 + 25276359553600 = 366639^2 + 5027560^2 .

It is not a de Polignac number, because 25410783709921 - 2⁴³ = 16614690687713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25410783709721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 398200065 + ... + 398263873.

Almost surely, 2^{25410783709921} is an apocalyptic number.

25410783709921 is the 5040911-st square number.

25410783709921 is the 2520456-th centered octagonal number.

It is an amenable number.

25410783709921 is a deficient number, since it is larger than the sum of its proper divisors (326130421490).

25410783709921 is an frugal number, since it uses more digits than its factorization.

25410783709921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127776 (or 63888 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 25410783709921 in words is "twenty-five trillion, four hundred ten billion, seven hundred eighty-three million, seven hundred nine thousand, nine hundred twenty-one".