6542641251 has 24 divisors (see below), whose sum is σ = 9984386880. Its totient is φ = 4121744256.

The previous prime is 6542641229. The next prime is 6542641271. The reversal of 6542641251 is 1521462456.

6542641251 is a `hidden beast` number, since 6 + 5 + 4 + 2 + 641 + 2 + 5 + 1 = 666.

It is not a de Polignac number, because 6542641251 - 2⁵ = 6542641219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6542641201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254410 + ... + 278943.

It is an arithmetic number, because the mean of its divisors is an integer number (416016120).

Almost surely, 2^6542641251 is an apocalyptic number.

6542641251 is a deficient number, since it is larger than the sum of its proper divisors (3441745629).

6542641251 is a wasteful number, since it uses less digits than its factorization.

6542641251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533435 (or 533432 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 6542641251 is about 80886.5950018914. The cubic root of 6542641251 is about 1870.3276853381.

The spelling of 6542641251 in words is "six billion, five hundred forty-two million, six hundred forty-one thousand, two hundred fifty-one".