205102061542654 has 16 divisors (see below), whose sum is σ = 317577762080640. Its totient is φ = 99242815358880.

The previous prime is 205102061542633. The next prime is 205102061542661. The reversal of 205102061542654 is 456245160201502.

It is a happy number.

It is a super-2 number, since 2×205102061542654² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205102061542654.

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, 74808552 + ... + 77501764.

It is an arithmetic number, because the mean of its divisors is an integer number (19848610130040).

Almost surely, 2^{205102061542654} is an apocalyptic number.

205102061542654 is a deficient number, since it is larger than the sum of its proper divisors (112475700537986).

205102061542654 is a wasteful number, since it uses less digits than its factorization.

205102061542654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3921555.

The product of its (nonzero) digits is 576000, while the sum is 43.

The spelling of 205102061542654 in words is "two hundred five trillion, one hundred two billion, sixty-one million, five hundred forty-two thousand, six hundred fifty-four".