140665455421 has 2 divisors, whose sum is σ = 140665455422. Its totient is φ = 140665455420.

The previous prime is 140665455383. The next prime is 140665455443. The reversal of 140665455421 is 124554566041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140107976100 + 557479321 = 374310^2 + 23611^2 .

It is an emirp because it is prime and its reverse (124554566041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140665455421 - 2²⁵ = 140631900989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140665455451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70332727710 + 70332727711.

It is an arithmetic number, because the mean of its divisors is an integer number (70332727711).

Almost surely, 2^140665455421 is an apocalyptic number.

It is an amenable number.

140665455421 is a deficient number, since it is larger than the sum of its proper divisors (1).

140665455421 is an equidigital number, since it uses as much as digits as its factorization.

140665455421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576000, while the sum is 43.

The spelling of 140665455421 in words is "one hundred forty billion, six hundred sixty-five million, four hundred fifty-five thousand, four hundred twenty-one".