25191551357 has 6 divisors (see below), whose sum is σ = 29304457758. Its totient is φ = 21592758264.

The previous prime is 25191551347. The next prime is 25191551431. The reversal of 25191551357 is 75315519152.

It can be written as a sum of positive squares in only one way, i.e., 13956823321 + 11234728036 = 118139^2 + 105994^2 .

It is not a de Polignac number, because 25191551357 - 2¹⁰ = 25191550333 is a prime.

It is a super-2 number, since 2×25191551357² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25191551327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 257056598 + ... + 257056695.

It is an arithmetic number, because the mean of its divisors is an integer number (4884076293).

Almost surely, 2^25191551357 is an apocalyptic number.

It is an amenable number.

25191551357 is a deficient number, since it is larger than the sum of its proper divisors (4112906401).

25191551357 is an equidigital number, since it uses as much as digits as its factorization.

25191551357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514113307 (or 514113300 counting only the distinct ones).

The product of its digits is 236250, while the sum is 44.

The spelling of 25191551357 in words is "twenty-five billion, one hundred ninety-one million, five hundred fifty-one thousand, three hundred fifty-seven".