6545218940461 has 4 divisors (see below), whose sum is σ = 6545407484124. Its totient is φ = 6545030396800.

The previous prime is 6545218940441. The next prime is 6545218940539. The reversal of 6545218940461 is 1640498125456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1571400138025 + 4973818802436 = 1253555^2 + 2230206^2 .

It is a cyclic number.

It is not a de Polignac number, because 6545218940461 - 2¹⁵ = 6545218907693 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 (6545218940411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94219750 + ... + 94289191.

It is an arithmetic number, because the mean of its divisors is an integer number (1636351871031).

Almost surely, 2^{6545218940461} is an apocalyptic number.

It is an amenable number.

6545218940461 is a deficient number, since it is larger than the sum of its proper divisors (188543663).

6545218940461 is a wasteful number, since it uses less digits than its factorization.

6545218940461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188543662.

The product of its (nonzero) digits is 8294400, while the sum is 55.

The spelling of 6545218940461 in words is "six trillion, five hundred forty-five billion, two hundred eighteen million, nine hundred forty thousand, four hundred sixty-one".