25166134501 has 4 divisors (see below), whose sum is σ = 26646495372. Its totient is φ = 23685773632.

The previous prime is 25166134493. The next prime is 25166134523. The reversal of 25166134501 is 10543166152.

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 14001042276 + 11165092225 = 118326^2 + 105665^2 .

It is a cyclic number.

It is not a de Polignac number, because 25166134501 - 2³ = 25166134493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25166134901) 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, 740180410 + ... + 740180443.

It is an arithmetic number, because the mean of its divisors is an integer number (6661623843).

Almost surely, 2^25166134501 is an apocalyptic number.

It is an amenable number.

25166134501 is a deficient number, since it is larger than the sum of its proper divisors (1480360871).

25166134501 is a wasteful number, since it uses less digits than its factorization.

25166134501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480360870.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 25166134501 in words is "twenty-five billion, one hundred sixty-six million, one hundred thirty-four thousand, five hundred one".