10206256420655 has 4 divisors (see below), whose sum is σ = 12247507704792. Its totient is φ = 8165005136520.

The previous prime is 10206256420651. The next prime is 10206256420687. The reversal of 10206256420655 is 55602465260201.

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

It is not a de Polignac number, because 10206256420655 - 2² = 10206256420651 is a prime.

It is a super-2 number, since 2×10206256420655² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10206256420651) 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, 1020625642061 + ... + 1020625642070.

It is an arithmetic number, because the mean of its divisors is an integer number (3061876926198).

Almost surely, 2^{10206256420655} is an apocalyptic number.

10206256420655 is a deficient number, since it is larger than the sum of its proper divisors (2041251284137).

10206256420655 is an equidigital number, since it uses as much as digits as its factorization.

10206256420655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041251284136.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 10206256420655 in words is "ten trillion, two hundred six billion, two hundred fifty-six million, four hundred twenty thousand, six hundred fifty-five".