1620126543 has 16 divisors (see below), whose sum is σ = 2519148800. Its totient is φ = 925786008.

The previous prime is 1620126533. The next prime is 1620126577. The reversal of 1620126543 is 3456210261.

It is not a de Polignac number, because 1620126543 - 2⁴ = 1620126527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1620126543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620126533) 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, 786205 + ... + 788262.

It is an arithmetic number, because the mean of its divisors is an integer number (157446800).

Almost surely, 2^1620126543 is an apocalyptic number.

1620126543 is a deficient number, since it is larger than the sum of its proper divisors (899022257).

1620126543 is an equidigital number, since it uses as much as digits as its factorization.

1620126543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574491 (or 1574477 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1620126543 is about 40250.7955573551. The cubic root of 1620126543 is about 1174.4908717456.

The spelling of 1620126543 in words is "one billion, six hundred twenty million, one hundred twenty-six thousand, five hundred forty-three".