420155140081 has 2 divisors, whose sum is σ = 420155140082. Its totient is φ = 420155140080.

The previous prime is 420155140079. The next prime is 420155140157. The reversal of 420155140081 is 180041551024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 413598189456 + 6556950625 = 643116^2 + 80975^2 .

It is a cyclic number.

It is not a de Polignac number, because 420155140081 - 2¹ = 420155140079 is a prime.

It is a super-2 number, since 2×420155140081² (a number of 24 digits) contains 22 as substring.

Together with 420155140079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (420155140061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210077570040 + 210077570041.

It is an arithmetic number, because the mean of its divisors is an integer number (210077570041).

Almost surely, 2^420155140081 is an apocalyptic number.

It is an amenable number.

420155140081 is a deficient number, since it is larger than the sum of its proper divisors (1).

420155140081 is an equidigital number, since it uses as much as digits as its factorization.

420155140081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 31.

The spelling of 420155140081 in words is "four hundred twenty billion, one hundred fifty-five million, one hundred forty thousand, eighty-one".