420725556731 has 2 divisors, whose sum is σ = 420725556732. Its totient is φ = 420725556730.

The previous prime is 420725556721. The next prime is 420725556749. The reversal of 420725556731 is 137655527024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420725556731 is a prime.

It is a super-2 number, since 2×420725556731² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420725556721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210362778365 + 210362778366.

It is an arithmetic number, because the mean of its divisors is an integer number (210362778366).

Almost surely, 2^420725556731 is an apocalyptic number.

420725556731 is a deficient number, since it is larger than the sum of its proper divisors (1).

420725556731 is an equidigital number, since it uses as much as digits as its factorization.

420725556731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764000, while the sum is 47.

The spelling of 420725556731 in words is "four hundred twenty billion, seven hundred twenty-five million, five hundred fifty-six thousand, seven hundred thirty-one".