42905565454691 has 2 divisors, whose sum is σ = 42905565454692. Its totient is φ = 42905565454690.

The previous prime is 42905565454657. The next prime is 42905565454751. The reversal of 42905565454691 is 19645456550924.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42905565454691 is a prime.

It is not a weakly prime, because it can be changed into another prime (42905565454391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21452782727345 + 21452782727346.

It is an arithmetic number, because the mean of its divisors is an integer number (21452782727346).

Almost surely, 2^{42905565454691} is an apocalyptic number.

42905565454691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42905565454691 is an equidigital number, since it uses as much as digits as its factorization.

42905565454691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280000, while the sum is 65.

Adding to 42905565454691 its sum of digits (65), we get a square (42905565454756 = 6550234²).

The spelling of 42905565454691 in words is "forty-two trillion, nine hundred five billion, five hundred sixty-five million, four hundred fifty-four thousand, six hundred ninety-one".