623999437979 has 2 divisors, whose sum is σ = 623999437980. Its totient is φ = 623999437978.

The previous prime is 623999437961. The next prime is 623999438089. The reversal of 623999437979 is 979734999326.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 623999437979 - 2³² = 619704470683 is a prime.

It is not a weakly prime, because it can be changed into another prime (623999437909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311999718989 + 311999718990.

It is an arithmetic number, because the mean of its divisors is an integer number (311999718990).

Almost surely, 2^623999437979 is an apocalyptic number.

623999437979 is a deficient number, since it is larger than the sum of its proper divisors (1).

623999437979 is an equidigital number, since it uses as much as digits as its factorization.

623999437979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1249949232, while the sum is 77.

The spelling of 623999437979 in words is "six hundred twenty-three billion, nine hundred ninety-nine million, four hundred thirty-seven thousand, nine hundred seventy-nine".