215138555743 has 4 divisors (see below), whose sum is σ = 216264935808. Its totient is φ = 214012175680.

The previous prime is 215138555717. The next prime is 215138555747. The reversal of 215138555743 is 347555831512.

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

It is a cyclic number.

It is not a de Polignac number, because 215138555743 - 2⁵ = 215138555711 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 (215138555747) 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, 563189746 + ... + 563190127.

It is an arithmetic number, because the mean of its divisors is an integer number (54066233952).

Almost surely, 2^215138555743 is an apocalyptic number.

215138555743 is a deficient number, since it is larger than the sum of its proper divisors (1126380065).

215138555743 is a wasteful number, since it uses less digits than its factorization.

215138555743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126380064.

The product of its digits is 2520000, while the sum is 49.

The spelling of 215138555743 in words is "two hundred fifteen billion, one hundred thirty-eight million, five hundred fifty-five thousand, seven hundred forty-three".