623836006561 has 2 divisors, whose sum is σ = 623836006562. Its totient is φ = 623836006560.

The previous prime is 623836006553. The next prime is 623836006567. The reversal of 623836006561 is 165600638326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619811372961 + 4024633600 = 787281^2 + 63440^2 .

It is a cyclic number.

It is not a de Polignac number, because 623836006561 - 2³ = 623836006553 is a prime.

It is not a weakly prime, because it can be changed into another prime (623836006567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311918003280 + 311918003281.

It is an arithmetic number, because the mean of its divisors is an integer number (311918003281).

Almost surely, 2^623836006561 is an apocalyptic number.

It is an amenable number.

623836006561 is a deficient number, since it is larger than the sum of its proper divisors (1).

623836006561 is an equidigital number, since it uses as much as digits as its factorization.

623836006561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 623836006561 in words is "six hundred twenty-three billion, eight hundred thirty-six million, six thousand, five hundred sixty-one".