2157424246525 has 12 divisors (see below), whose sum is σ = 2676228388372. Its totient is φ = 1725279834240.

The previous prime is 2157424246517. The next prime is 2157424246529. The reversal of 2157424246525 is 5256424247512.

It can be written as a sum of positive squares in 6 ways, for example, as 56162364196 + 2101261882329 = 236986^2 + 1449573^2 .

It is not a de Polignac number, because 2157424246525 - 2³ = 2157424246517 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 (2157424246529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16422342 + ... + 16553191.

Almost surely, 2^{2157424246525} is an apocalyptic number.

2157424246525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2157424246525 is a deficient number, since it is larger than the sum of its proper divisors (518804141847).

2157424246525 is a wasteful number, since it uses less digits than its factorization.

2157424246525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32978160 (or 32978155 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 49.

The spelling of 2157424246525 in words is "two trillion, one hundred fifty-seven billion, four hundred twenty-four million, two hundred forty-six thousand, five hundred twenty-five".