420051756991 has 2 divisors, whose sum is σ = 420051756992. Its totient is φ = 420051756990.

The previous prime is 420051756979. The next prime is 420051757001. The reversal of 420051756991 is 199657150024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420051756991 is a prime.

It is a super-2 number, since 2×420051756991² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420051756791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210025878495 + 210025878496.

It is an arithmetic number, because the mean of its divisors is an integer number (210025878496).

Almost surely, 2^420051756991 is an apocalyptic number.

420051756991 is a deficient number, since it is larger than the sum of its proper divisors (1).

420051756991 is an equidigital number, since it uses as much as digits as its factorization.

420051756991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 420051756991 in words is "four hundred twenty billion, fifty-one million, seven hundred fifty-six thousand, nine hundred ninety-one".