641849334025 has 9 divisors (see below), whose sum is σ = 795898141383. Its totient is φ = 513476262600.

The previous prime is 641849333981. The next prime is 641849334067. The reversal of 641849334025 is 520433948146.

The square root of 641849334025 is 801155.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 231065760249 + 410783573776 = 480693^2 + 640924^2 .

It is not a de Polignac number, because 641849334025 - 2¹³ = 641849325833 is a prime.

It is a super-3 number, since 3×641849334025³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641849334025.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3925660 + ... + 4085890.

Almost surely, 2^641849334025 is an apocalyptic number.

641849334025 is the 801155-th square number.

641849334025 is the 400578-th centered octagonal number.

It is an amenable number.

641849334025 is a deficient number, since it is larger than the sum of its proper divisors (154048807358).

641849334025 is an frugal number, since it uses more digits than its factorization.

641849334025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320472 (or 160236 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 49.

Multiplying 641849334025 by its sum of digits (49), we get a square (31450617367225 = 5608085²).

The spelling of 641849334025 in words is "six hundred forty-one billion, eight hundred forty-nine million, three hundred thirty-four thousand, twenty-five".