205214647438 has 4 divisors (see below), whose sum is σ = 307821971160. Its totient is φ = 102607323718.

The previous prime is 205214647427. The next prime is 205214647439. The reversal of 205214647438 is 834746412502.

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

It is a super-2 number, since 2×205214647438² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205214647439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51303661858 + ... + 51303661861.

It is an arithmetic number, because the mean of its divisors is an integer number (76955492790).

Almost surely, 2^205214647438 is an apocalyptic number.

205214647438 is a deficient number, since it is larger than the sum of its proper divisors (102607323722).

205214647438 is a wasteful number, since it uses less digits than its factorization.

205214647438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102607323721.

The product of its (nonzero) digits is 1290240, while the sum is 46.

The spelling of 205214647438 in words is "two hundred five billion, two hundred fourteen million, six hundred forty-seven thousand, four hundred thirty-eight".