1628878256653 has 4 divisors (see below), whose sum is σ = 1643822093980. Its totient is φ = 1613934419328.

The previous prime is 1628878256617. The next prime is 1628878256693. The reversal of 1628878256653 is 3566528788261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1197704793609 + 431173463044 = 1094397^2 + 656638^2 .

It is not a de Polignac number, because 1628878256653 - 2¹³ = 1628878248461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628878256693) 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, 7471918500 + ... + 7471918717.

It is an arithmetic number, because the mean of its divisors is an integer number (410955523495).

Almost surely, 2^{1628878256653} is an apocalyptic number.

It is an amenable number.

1628878256653 is a deficient number, since it is larger than the sum of its proper divisors (14943837327).

1628878256653 is a wasteful number, since it uses less digits than its factorization.

1628878256653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14943837326.

The product of its digits is 232243200, while the sum is 67.

The spelling of 1628878256653 in words is "one trillion, six hundred twenty-eight billion, eight hundred seventy-eight million, two hundred fifty-six thousand, six hundred fifty-three".