542518721638 has 16 divisors (see below), whose sum is σ = 849306236256. Its totient is φ = 259420712320.

The previous prime is 542518721611. The next prime is 542518721671. The reversal of 542518721638 is 836127815245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747043 + ... + 1281838.

It is an arithmetic number, because the mean of its divisors is an integer number (53081639766).

Almost surely, 2^542518721638 is an apocalyptic number.

542518721638 is a deficient number, since it is larger than the sum of its proper divisors (306787514618).

542518721638 is a wasteful number, since it uses less digits than its factorization.

542518721638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034719.

The product of its digits is 3225600, while the sum is 52.

The spelling of 542518721638 in words is "five hundred forty-two billion, five hundred eighteen million, seven hundred twenty-one thousand, six hundred thirty-eight".