25122655775540 has 24 divisors (see below), whose sum is σ = 52758056115240. Its totient is φ = 10048971074688.

The previous prime is 25122655775509. The next prime is 25122655775549. The reversal of 25122655775540 is 4557755622152.

It can be written as a sum of positive squares in 4 ways, for example, as 7319167516816 + 17803488258724 = 2705396^2 + 4219418^2 .

It is a super-2 number, since 2×25122655775540² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25122655775549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3422027 + ... + 7871186.

It is an arithmetic number, because the mean of its divisors is an integer number (2198252338135).

Almost surely, 2^{25122655775540} is an apocalyptic number.

25122655775540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25122655775540 is an abundant number, since it is smaller than the sum of its proper divisors (27635400339700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25122655775540 is a wasteful number, since it uses less digits than its factorization.

25122655775540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11404451 (or 11404449 counting only the distinct ones).

The product of its (nonzero) digits is 29400000, while the sum is 56.

The spelling of 25122655775540 in words is "twenty-five trillion, one hundred twenty-two billion, six hundred fifty-five million, seven hundred seventy-five thousand, five hundred forty".