42859437693991 has 2 divisors, whose sum is σ = 42859437693992. Its totient is φ = 42859437693990.

The previous prime is 42859437693983. The next prime is 42859437693997. The reversal of 42859437693991 is 19939673495824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42859437693991 - 2³ = 42859437693983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42859437693997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21429718846995 + 21429718846996.

It is an arithmetic number, because the mean of its divisors is an integer number (21429718846996).

Almost surely, 2^{42859437693991} is an apocalyptic number.

42859437693991 is a deficient number, since it is larger than the sum of its proper divisors (1).

42859437693991 is an equidigital number, since it uses as much as digits as its factorization.

42859437693991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3174474240, while the sum is 79.

The spelling of 42859437693991 in words is "forty-two trillion, eight hundred fifty-nine billion, four hundred thirty-seven million, six hundred ninety-three thousand, nine hundred ninety-one".