1620203706255 has 16 divisors (see below), whose sum is σ = 2592390234240. Its totient is φ = 864087208608.

The previous prime is 1620203706227. The next prime is 1620203706257. The reversal of 1620203706255 is 5526073020261.

It is a happy number.

It is not a de Polignac number, because 1620203706255 - 2³² = 1615908738959 is a prime.

It is a super-2 number, since 2×1620203706255² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620203706257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 705117 + ... + 1933286.

It is an arithmetic number, because the mean of its divisors is an integer number (162024389640).

Almost surely, 2^{1620203706255} is an apocalyptic number.

1620203706255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1620203706255 is a deficient number, since it is larger than the sum of its proper divisors (972186527985).

1620203706255 is a wasteful number, since it uses less digits than its factorization.

1620203706255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679350.

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 1620203706255 in words is "one trillion, six hundred twenty billion, two hundred three million, seven hundred six thousand, two hundred fifty-five".