42400993669 has 2 divisors, whose sum is σ = 42400993670. Its totient is φ = 42400993668.

The previous prime is 42400993643. The next prime is 42400993753. The reversal of 42400993669 is 96639900424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38736144225 + 3664849444 = 196815^2 + 60538^2 .

It is a cyclic number.

It is not a de Polignac number, because 42400993669 - 2¹³ = 42400985477 is a prime.

It is a super-2 number, since 2×42400993669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42400993169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200496834 + 21200496835.

It is an arithmetic number, because the mean of its divisors is an integer number (21200496835).

Almost surely, 2^42400993669 is an apocalyptic number.

It is an amenable number.

42400993669 is a deficient number, since it is larger than the sum of its proper divisors (1).

42400993669 is an equidigital number, since it uses as much as digits as its factorization.

42400993669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 52.

The spelling of 42400993669 in words is "forty-two billion, four hundred million, nine hundred ninety-three thousand, six hundred sixty-nine".