423640355357 has 2 divisors, whose sum is σ = 423640355358. Its totient is φ = 423640355356.

The previous prime is 423640355329. The next prime is 423640355387. The reversal of 423640355357 is 753553046324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409505285476 + 14135069881 = 639926^2 + 118891^2 .

It is a cyclic number.

It is not a de Polignac number, because 423640355357 - 2⁶ = 423640355293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423640355387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211820177678 + 211820177679.

It is an arithmetic number, because the mean of its divisors is an integer number (211820177679).

Almost surely, 2^423640355357 is an apocalyptic number.

It is an amenable number.

423640355357 is a deficient number, since it is larger than the sum of its proper divisors (1).

423640355357 is an equidigital number, since it uses as much as digits as its factorization.

423640355357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000, while the sum is 47.

The spelling of 423640355357 in words is "four hundred twenty-three billion, six hundred forty million, three hundred fifty-five thousand, three hundred fifty-seven".