1620626057 has 2 divisors, whose sum is σ = 1620626058. Its totient is φ = 1620626056.

The previous prime is 1620626041. The next prime is 1620626093. The reversal of 1620626057 is 7506260261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1146431881 + 474194176 = 33859^2 + 21776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620626057 - 2⁴ = 1620626041 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620626017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810313028 + 810313029.

It is an arithmetic number, because the mean of its divisors is an integer number (810313029).

Almost surely, 2^1620626057 is an apocalyptic number.

It is an amenable number.

1620626057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620626057 is an equidigital number, since it uses as much as digits as its factorization.

1620626057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1620626057 is about 40257.0000993616. Note that the first 4 decimals coincide. The cubic root of 1620626057 is about 1174.6115648589.

The spelling of 1620626057 in words is "one billion, six hundred twenty million, six hundred twenty-six thousand, fifty-seven".