1621706839463 has 4 divisors (see below), whose sum is σ = 1621741327200. Its totient is φ = 1621672351728.

The previous prime is 1621706839453. The next prime is 1621706839499. The reversal of 1621706839463 is 3649386071261.

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

It is a cyclic number.

It is not a de Polignac number, because 1621706839463 - 2⁶ = 1621706839399 is a prime.

It is a super-2 number, since 2×1621706839463² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1621706839399 and 1621706839408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621706839453) 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, 17173238 + ... + 17267411.

It is an arithmetic number, because the mean of its divisors is an integer number (405435331800).

Almost surely, 2^{1621706839463} is an apocalyptic number.

1621706839463 is a deficient number, since it is larger than the sum of its proper divisors (34487737).

1621706839463 is an equidigital number, since it uses as much as digits as its factorization.

1621706839463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34487736.

The product of its (nonzero) digits is 7838208, while the sum is 56.

The spelling of 1621706839463 in words is "one trillion, six hundred twenty-one billion, seven hundred six million, eight hundred thirty-nine thousand, four hundred sixty-three".