6540742655 has 16 divisors (see below), whose sum is σ = 8016861600. Its totient is φ = 5121390720.

The previous prime is 6540742643. The next prime is 6540742657. The reversal of 6540742655 is 5562470456.

It is not a de Polignac number, because 6540742655 - 2¹⁶ = 6540677119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540742657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19145 + ... + 115965.

It is an arithmetic number, because the mean of its divisors is an integer number (501053850).

Almost surely, 2^6540742655 is an apocalyptic number.

6540742655 is a deficient number, since it is larger than the sum of its proper divisors (1476118945).

6540742655 is a wasteful number, since it uses less digits than its factorization.

6540742655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97114.

The product of its (nonzero) digits is 1008000, while the sum is 44.

The square root of 6540742655 is about 80874.8579906018. The cubic root of 6540742655 is about 1870.1467522833.

The spelling of 6540742655 in words is "six billion, five hundred forty million, seven hundred forty-two thousand, six hundred fifty-five".