10206610121555 has 4 divisors (see below), whose sum is σ = 12247932145872. Its totient is φ = 8165288097240.

The previous prime is 10206610121551. The next prime is 10206610121573. The reversal of 10206610121555 is 55512101660201.

10206610121555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 10206610121555 - 2² = 10206610121551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10206610121551) 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, 1020661012151 + ... + 1020661012160.

It is an arithmetic number, because the mean of its divisors is an integer number (3061983036468).

Almost surely, 2^{10206610121555} is an apocalyptic number.

10206610121555 is a deficient number, since it is larger than the sum of its proper divisors (2041322024317).

10206610121555 is an equidigital number, since it uses as much as digits as its factorization.

10206610121555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041322024316.

The product of its (nonzero) digits is 18000, while the sum is 35.

Adding to 10206610121555 its reverse (55512101660201), we get a palindrome (65718711781756).

The spelling of 10206610121555 in words is "ten trillion, two hundred six billion, six hundred ten million, one hundred twenty-one thousand, five hundred fifty-five".