25745835381 has 32 divisors (see below), whose sum is σ = 41018296320. Its totient is φ = 14044476864.

The previous prime is 25745835341. The next prime is 25745835433. The reversal of 25745835381 is 18353854752.

It is a happy number.

It is not a de Polignac number, because 25745835381 - 2¹⁸ = 25745573237 is a prime.

It is a super-2 number, since 2×25745835381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25745835341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193486 + ... + 298208.

It is an arithmetic number, because the mean of its divisors is an integer number (1281821760).

Almost surely, 2^25745835381 is an apocalyptic number.

25745835381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25745835381 is a deficient number, since it is larger than the sum of its proper divisors (15272460939).

25745835381 is a wasteful number, since it uses less digits than its factorization.

25745835381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105265.

The product of its digits is 4032000, while the sum is 51.

The spelling of 25745835381 in words is "twenty-five billion, seven hundred forty-five million, eight hundred thirty-five thousand, three hundred eighty-one".