6540551406 has 24 divisors (see below), whose sum is σ = 15004795104. Its totient is φ = 2051937600.

The previous prime is 6540551371. The next prime is 6540551429. The reversal of 6540551406 is 6041550456.

6540551406 is a `hidden beast` number, since 65 + 4 + 0 + 551 + 40 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10686870 + ... + 10687481.

It is an arithmetic number, because the mean of its divisors is an integer number (625199796).

Almost surely, 2^6540551406 is an apocalyptic number.

6540551406 is an abundant number, since it is smaller than the sum of its proper divisors (8464243698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6540551406 is a wasteful number, since it uses less digits than its factorization.

6540551406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21374376 (or 21374373 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 6540551406 is about 80873.6756058484. The cubic root of 6540551406 is about 1870.1285246293.

The spelling of 6540551406 in words is "six billion, five hundred forty million, five hundred fifty-one thousand, four hundred six".