1623428243261 has 6 divisors (see below), whose sum is σ = 1784429391486. Its totient is φ = 1475843857400.

The previous prime is 1623428243243. The next prime is 1623428243267.

1623428243261 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 1623267105625 + 161137636 = 1274075^2 + 12694^2 .

It is not a de Polignac number, because 1623428243261 - 2¹⁴ = 1623428226877 is a prime.

It is a super-2 number, since 2×1623428243261² (a number of 25 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 (1623428243267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6708381050 + ... + 6708381291.

It is an arithmetic number, because the mean of its divisors is an integer number (297404898581).

Almost surely, 2^{1623428243261} is an apocalyptic number.

1623428243261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1623428243261 is a deficient number, since it is larger than the sum of its proper divisors (161001148225).

1623428243261 is a wasteful number, since it uses less digits than its factorization.

1623428243261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13416762363 (or 13416762352 counting only the distinct ones).

The product of its digits is 663552, while the sum is 44.

The spelling of 1623428243261 in words is "one trillion, six hundred twenty-three billion, four hundred twenty-eight million, two hundred forty-three thousand, two hundred sixty-one".